Are 862 Heads Cathedral Port5* Advance 3400+ Stall Recommended MAX Duration for Stock Pistons w/ Unmilled Heads. Are Chevy 862 Heads Any Good? The Chevy 862 heads are a good option for those on a budget. 0L cathedral port cylinder head-equipped truck engines and cathedral port LS1, -2, -6 applications where hood clearance is not a concern, the FAST™ LSXRT™102mm Intake Manifold follows the path chartered by the original FAST ™ LSX™ Gen III Intake by featuring a modular design that allows for easy. 0L/364 Cylinder Heads and get Free Shipping on Orders Over $109 at Summit Racing! $5 Off Your $100 Mobile App Purchase Chevy LS Cylinder head, 210cc Cathedral port Intake Runner, 64cc Chamber, 2. Ensure Proper FitTo confirm that this part fits your vehicle, enter your vehicle's Year, Make, Model, Trim and Engine in the Compatibility Table. Ask Away! with Jeff Smith: Rectangle vs. Exhaust Valve, Chevy, LT, Pair. 780" (+) Bore - Pair Black Label CNC Cylinder Head - Stainless or Titanium Valves. But again, porting costs cash, so 706 heads is the best choice to cast in stock form. Cylinder Head buyers have a tendency to only consider peak flow numbers. There is a lot of misinformation about cam profiles favoring one head design over another and it would be interesting to see how well these cam specs worked on each application. Will the throttle body plug in, (drive by wire) be the same for a 06 escalade with a 6. Some early LS heads from 98-01, both the 853/806 LS1 and the 706/862 5. Continue reading as we show you all you need to know about 862 heads upgrading to one. This makes it very easier to design and port the heads so each cylinder flows equally, which helps make power. Constructed from lightweight aluminum material, these cylinder heads feature a 61cc combustion chamber volume for improved efficiency and performance. 3 Vortec Cathedral Port GM Chevy GMC at the best online prices at eBay! Free shipping for many products!. These cams are best matched to combinations using cathedral port heads. Intake - Cathedral; Exhaust - D-Port: Intake/Exhaust Port Volume: Intake - 200 cc; Exhaust - 70 cc: Combustion Chamber Volume: 61. 2006 square port zo6 intake,bolt to cathedral 862 heads?. Buy in monthly payments with Affirm on orders over $50. Look at the super Chevy test linked above. The smaller combustion chamber on these bumps the compression ratio up significantly on the larger LS family engines. Texas Speed Beehive Spring Cam Kit for Cathedral Port Heads. Cathedral Port LS1/LS2/LS6 (103) Stock (7) Cathedral Port (6) Rectangular Port (6) Mast Motorsports Mozez Heads (4) LS3 (2) LT5 (2) Raised Rectangular Port LS7 (2) Rectangular Port LS3/L76/L92/L99 (2) Get Results; Fuel Injection Style. Specifications: GM Stock LS Cathedral. Hundreds of thousands of 1999 862 heads and up to 4. The 862 castings from Cathedral Port are a great option for those looking to make big power. The cylinder heads’ intake port and exhaust port shapes are cathedral and D-port, respectively. • High-Speed brush deburring to remove sharp edges …. THE WORLDS MOST BAD A$$ Cathedral Port CYLINDER HEAD!!!. The ECS tensioner, a blower pulley/idler spacers would work if Whipple mounts the C6 Corvette head unit on their cathedral port manifold. 2L version, produced from 2008-2017 for the Corvette, Pontiac G8, Camaro and Holden models. Cylinder Head Plug From 2006 GMC Sierra 1500 5. The intake is available with multiple plenum tops and even blank tops are available for completely universal applications. The LS Race single-plane intake manifold was designed for hi-performance/racing engine applications, 5. With peak flow numbers of 315 cfm, the heads could easily support any power level offered by the cam swap. The 243-cylinder head features both an intake port shape and an exhaust port shape designed for maximum efficiency. In addition, the LS2 has become known for its high-performance potential due to its large displacement, high compression ratio for a factory engine, and unique cathedral port cylinder heads. It is no secret that the 243 heads from GM offer a substantial performance boost to any engine. Since then, these two variations of cathedral port heads have earned a reputation as some of the best performing OEM head castings available. Location: Maryland LS 862 head porting by cgarb » Thu Jun 02, 2016 7:25 am I have a cylinder head job to do for a coworker of mine. If you haven’t already, check out our LS1 Throttle Body Modification that allows for 100% Wide Open Throttle (WOT) operation. *Due to the chamber size of these heads a 6. 035 /317 '99-up LQ9 and LQ4 6. However, the 706 heads are more sophisticated than the 862 heads. • Application: Intake manifold will fit Cathedral Port LS1/LS2/LS6 heads. Bore w/59 cc Combustion Chambers (0) $1,874. Extracting power is surprisingly easy as compared to it's Square Port cousin, by me at least. The 799 head flow supersedes that of 706 heads with as much as about 20 cfm at specific lift points. The cylinder heads are designed with aluminum materials with a 61cc combustion chamber volume. by nobody special » Wed Jun 08, 2016 1:45 pm. With over 500 hp, the L92 heads had their work cut out for them. So those particular heads won't fit the LS1 but will fit an LS2. Surprising HP Numbers From Our Stock LS Cylinder Head Test. Locate 862 Heads on sale below with the biggest variety of 862 Heads anywhere online. The Vortec HO 6000 or VortecMAX is a special high-output version of the Vortec 6000 V8 truck engine originally designed for Cadillac. Factory square port stuff just can't be beat for the price. 3 GM 862 SINGLE HEAD CATHEDRAL PORT OEM …. Jump to Latest Follow 1 - 3 of 3 Posts. In the tale of the tape, the cathedral-port heads offered 245cc intake ports, a 2. which stock ls head makes the most power? should i upgrade my stock 6. They depict an excellent flowing head and provide higher compression. ls2 cylinder heads for sale. The exhaust ports get opened up to 84cc, and the chambers stay at 65cc in the off-the-shelf configuration. Porting a set of 862’s, showing the update on raising the roof on the exhaust ports. In terms of port volumes, the 706 heads have larger intake ports. 2L L92 featured factory rectangular-port heads. 55 valves, 200cc intake port, 67cc chambers, 200 intake port volume, cathedral ports, 70cc exhaust port volume, aluminum. 0L LS1 LS2 LM7 L33 LQ4 LQ9 Compatible with OEM Casting #'s 243, 241, 799, 853, 706, 862, 317 Fits Trick Flow $469. If you are still not convinced, read. 2L Hellcat Cylinder Heads $ 4,058. It features high-compression (10:1) flat-top pistons for an extra 10 hp (7 kW) and 10 lb·ft (14 N·m), bringing output to 345 hp (257. AFR 1501 LS1 210 Enforcer Heads, Cathedral Port, Assembled (3) Cylinder Head Style: Assembled. Lingenfelter's 243/799 CNC program opens the intake port (left) to 228cc and increases flow at. “At the end of the tests, [the cathedral port engine] made 645 horsepower and 545 lb-ft of torque, and the LS3 heads made 671 horsepower and 560 lb-ft. They are often called LS6 heads. Cathedral port, square port intake manifold. 890" intake valve, 200cc intake runner, a 1. Cylinder Head Bolt Style: Torque to Yield (TTY) Cylinder Head Bolt Size (2003) (8) M11 …. LS Cylinder Head Shootout! Choose the Best for Power">Gen IV LS Cylinder Head Shootout! Choose the Best for Power. 3LHeads (Customer Supplied Castings) PRC As-Cast 225cc LS1/LS2 Cathedral Heads - Big Chamber $ 2,203. Vehicle/Engine Search Vehicle/Engine Search Make/Model Search Make/Engine Search 64cc Chamber, 210cc Intake, Cathedral Port, Chevrolet, LS, Each See More Specifications | Check the Fit. But if they can't claim value then what else are they going to say? I thought it funny home boy was talking about these heads were so great as factory. This particular intake (300-256) sports a 4150 mounting flange for cathedral port heads but there’s a similar 4500 (300-295) mount version also available. Armed with the right knowledge, the correct tools, and a couple of. I've got 862's on my 325 in my Scout LS swap. Are 862 or 706 heads better? The 706Vortec heads are even slightly superior to the commonly found …. So if you would rather spend your money on 243 heads, check your local junkyard first. Find many great new & used options and get the best deals for Pair 862 LS Heads Set 4. All done by videos and some instruction from cousin all and all aprox 60 hours port time ramps left in place but smoothed out these are bare heads which you can get a good price on they take 2” valves and 1. The bigger heads to follow were the “double-hump” heads championed by the mid-’60s 327 engines. 660 Springs, Bronze Guides, $949. com FREE DELIVERY possible on …. what are the best factory LS heads?. Our best flowing cathedral port head when rules require cathedral ports. 165-inch diameter) and an exhaust port capacity of 87cc (1. Known for their affordability and power; Exceptional flow characteristics; Superior to 862 heads in reliability and performance; These heads have a cathedral-port design offering better flow compared to other stock LS heads. Texas Speed Beehive Spring Cam Kit for Cathedral Port Heads (LS1/LS2/LS6) This is the perfect upgrade package for customer looking for all the aftermarket parts needed to do a camshaft swap. They have the same valve size, port, and chamber cores. Our stage 1 porting service will include the re-use of the stock vales. The Difference Between All The LS Heads. Frankenstein CNC Ported 862 Cylinder Heads. Cylinder Head Bolt Style: Torque to Yield (TTY) Cylinder Head Bolt Size (1999-2003) (8) M11 x 2 x 155, (2) M11 x 2 x 100, (5) M8 x 1. The 862 heads are also designed with an optimized port design which allows for more air flow into the combustion chambers, resulting in increased torque and fuel economy. Find many great new & used options and get the best deals for Pair 862 LS Heads Set CORE FOR REPAIR 4. 000" Intake Average Flow: 218 CFM; Exhaust Average Flow: 171 CFM; Intake Seat Material: Ductile Iron; Intake Port Volume: 252cc; Exhaust Port Volume: 99 cc. 5:1+ Recommended Springs Required: GM LS6 Beehive Valve Springs. These heads have been disassembled, inspected, cleaned, 5 angle valve job, and milled slightly to clean up the heads. This cylinder head is a better flowing and stronger alternative to ported 243 and other factory cathedral port heads. It's also found in some luxury and sports cars. Any intake manifold (LS1, LS6, LS2) will work with these heads as well as Vortec intakes from cathedral port headed variants. Its much easier to identify what you have by individual traits and components. Get the best deals for 862 heads ported at eBay. Here’s the Edelbrock E-street cylinder head for GM LS cathedral-port engines. The factory cathedral-port heads used on the Gen 3 motors (LS1, 2, and 6, along. 59 in (40 mm) exhaust valves, and a 15 degree valve angle. Trick Flow GenX LS Cylinder Heads Now 50 State Emissions Legal. 862 cylinder heads are thought of as being the industry leader. 2003,2004,2005,2006 Sierra 1500 5. The power output of the 468 jumped from 692 hp at 6,500 rpm with stock L92 heads to 720 hp at 6,700 rpm with the CNC-ported versions. Chevy LS 862 Aluminum Heads Bare. NEW OEM 862 CYLINDER HEAD HAS SOME IMPERFECTIONS CHECK PICTURES WELL DOES NOT COME WITH ROCKERS. LS6 heads are the best Casting Number 706 and 862 Head: 1999+ 4. The 706Vortec heads are even slightly superior to the commonly found 862 heads. The 862 cylinder heads are GM’s generation III cylinder heads. GM LS1 LS2 LS6 Gen III / IV Rebuilt Cylinder Head single 799 Cathedral Port. 3 with 862 heads and a cam upgrade. Be prepared for a big price tag at the dealer or steep core charge from your head porter. 60 valve package combined with an intake port volume of 235 cc (ours measured 234 cc) and took top torque honors among the cathedral-port heads, though by only 0. 3l Cylinder Head Oem Casting 862 $300. Cylinder Head Bolt Style: Torque to Yield (TTY) Cylinder Head Bolt Size (10) M11 x 2 x 100, (5) M8 x 1. 300-130 – Designed for GM LS Gen III and IV engines equipped with OE or aftermarket LS1/2/6 cathedral-port cylinder heads. For road racing, a cathedral port is ideal, and has even proven to be quite capable in drag racing with an altered valve angle and larger runner sizes. Best Cam For Ls2 Stock Heads (2023 Update). 00 inches and an exhaust valve size of 1. Point is, the Trickflows make bad ass power for such a small port, and the LS7 port is lazy but shines in the high RPMs. 3L/325 Cylinder Heads and get Free Shipping on Orders Over $109 at Summit Racing! $5 Off Your $100 Cylinder Head, Enforcer, Aluminum, Assembled, 64cc Chamber, 210cc Intake, Cathedral Port, Chevrolet, LS, Each. 3L engine have used these heads but for most street applications the smaller cathedral port head is better suited to the 5. No cathedral head can come close. The special Fast As Cast® runner design. Chevy LS1 LS2 LS6 Cathedral Port Bare Aluminum Cylinder Head 225cc/62cc E42007. This is the big hunk of aluminum that caps your cylinders on one side of the V. The CNC Ported 862 LS Heads are the most demanding cylinder heads in the modern era. 862 cylinder heads’ popularity can be traced to their robust and durable casting, preventing them from altering their shape during intense engine operations. Cylinder Head Bolt Style: Torque to Yield …. If you ruin a port, practice on the other ports and then throw it away or cut it in half. ” So, despite the fact that they originally served duty in a lowly truck application, these castings. Texas Speed GM LS7 Rocker Arm Package w/ Comp Cams Trunnion Kit. 3 Hot Rod Camshaft for Gen 3/4 LS 4. Engine is supposed to have less than 90,000 miles and is clean as a pin on the inside. Here’s everything you need to know about these heads! The 862 castings from Cathedral Port are designed for 4. 862 Heads Specifications Here are some common of the 862 cylinder heads: Recommended: 6 Symptoms of a Cracked Cylinder Head Intake Port Valve Cathedral Exhaust Port Design D-SHAPED. Dyno Test: 120+ HP Gains and No Low. KAT-M7107 CNC Port LS1/Truck 862, 706 Cylinder Heads (PAIR). LY5 Cylinder Head Specs; Casting Numbers: 799, 243: Material: Aluminum: Combustion Chamber Volume: 65cc: Intake Port Shape: Cathedral: Intake Runner Volume: 210cc: Exhaust Port Shape: D-Port: Exhaust Runner Volume: 75cc: Intake Valve Diameter: 2. 00 inches, while the exhaust runner volume is 70cc with a valve diameter of 1. LS LS1 LS2 LS3 LS6 LS7 LSX 862 CYLINDER HEADS SET 4. 3 With 862 Heads (2023 Update) Best Baofeng Radio For Preppers (2023 Update) Best Barber Clippers For Black Hair (2023 …. 60 valve package with a 238/85cc port volume package to maximize airflow. ported 862 ls heads; walker inch band clamp; Suggest searches. 2 liter LS engines equipped with cathedral port, LS1 style heads and single plane intake manifolds like the Victor, High Ram, Mid Ram and GMPP style intake manifolds. FAST Cathedral Port Supercharger/Camshaft Power Packages for GM LS 303011 Supercharger, TVS2300, Black Powdercoated, Intercooler, Camshaft Kit, Hydraulic Roller, 233/247 Duration at. They come with either dual or beehive springs, 2. Square Port heads Cathedral Port heads Page 15 LS1TECH Camaro and Firebird Forum Discussion. Remember to watch a few videos on this so you can get all the info you need to get stuck in yoursel. Trick Flow® GenX® 225 Cylinder Heads for GM LS2 TFS. 3 CHEVY TAHOE CYLINDER HEADS 862 / 706 CASTING NUMBER. 00 Select options; AFR LS3 Heads $ 3,253. Cylinder Head Porting Service & More. The reason is that the 706 heads are SPM (semi-permanent mold) made, while the 862 heads are sand cast. Trick Flow GenX 205 Assembled Cylinder Head, Cathedral Port GM/LS 4. Description Our 706 & 862 ported heads include: Our in house CNC port; 11 Degree Cathedral $ – $ Select. ProMaxx Performance LS706NB: HEAD LS 706/862 BARE. LS6 heads are the best choice only when all-out power is needed. Yeah I was expecting to open this thread and have it be about 706/862 heads. You'll still need an intake manifold, ignition setup, oil pan, and other application-specific bits, but this fresh unit comes with refurbished "862" casting cathedral-port heads and was the least. pull a head and measure the bore and stroke if you can. Elederbrock PRO Port 225's, VS. These Trick Flow GenX® 205 cathedral port cylinder heads for GM 4. Combustion Chamber Volume: 61cc. The port and chambers are carefully designed to provide the best combination of high flow capabilities and improved port …. One thing though, the factory intake manifolds for cathedral port heads are marginal at best. JEGS LS Fabricated Intake Manifold for GM LS1, LS2, & LS6. With the introduction of the BP BR 1 13, BRODIX delivers the best LS cathedral port compatible cylinder head on the market. Lingenfelter CNC Ported Aluminum Cylinder Head Corvette LS2 …. III/IV LS-based Chevrolet street and performance engines with a 1500-6500 rpm power-band up to 1000 HP to the flywheel and contains a 3 BAR MAP sensor for power adder applications that supports up to 30 PSI of boost. Debuting on the LS1, the cathedral port heads were named for the distinctive shape of the intake port. is your Bore size For a Naturally Aspirated or a Nitrous motor, I'm a fan of the Cathedral port heads, when you start to force air into the motor, then its good to switch to a rectangle port head. These refer to the shape of the intake port. L59 Cylinder Head Specs; Years: 2002-07: Casting Numbers: 862, 706: Material: Aluminum: Combustion Chamber Volume: 61cc: Intake Port Shape: Cathedral: Intake Runner Volume: 200cc: Exhaust Port Shape: Oval: Exhaust Runner Volume: 70cc: Intake Valve Diameter: 1. The intake port is shaped in a classic cathedral design while the …. 550 stainless-steel valves and chromoly retainers. 10-inch) and peak flow (353 cfm at. The Chevy 19418251 intake will work as long as it bolts to square ports on the heads. Also, the port velocity on the 706/862 head is much better than the 799/243, which will help you with the small bore of the 5. 00" Flow Plate - No Exhaust Pipe. Intake – Cathedral; Exhaust – D-Port: Intake/Exhaust Port Volume: Intake – 200 cc; Exhaust – 70 cc: Combustion Chamber Volume: 61. 600 inch of lift, while the 82cc exhaust runner flows 207cfm at …. Find Intake Manifolds, Fuel Injected Cathedral Port LS1/LS2/LS6 Cylinder Head Configuration and get Free Shipping on Orders Over $109 at Summit Racing! $5 Off Your $100 Mobile App Purchase - Get the App. The combustion chamber volume is 65cc. 3L Vortec 5300 Engine Specs: Performance, Bore & Stroke. Both engines were run on pump gas, and the Trick Flow-headed engine wanted about 0. casting # ending in 241 - LS1 , with 2. Or look at Texas Speed or Brian Tooley in a stage two cam. This article compares 799 Vs 862 heads commonly found on LS engines. The different port styles can be seen in Figure 2. My 92mm T/B was used for all engines. Email address: Leave this field empty if you're human: FED LS1/2/6 Cathedral 862 Stage 1 $ Fresh off the assembly bench and available. The Vehicle Speed Sensor (VSS) …. Stall Converter Required: Yes, 3600+RPM. Total Engine Airflow Trick Flow 225CC Cylinder Heads for GM LS2. Typical gains will range from 30 to 65 rear-wheel horsepower from a TSP camshaft swap alone! The LSA (s) we typically stock for each camshaft is listed. Estimated to ship direct from manufacturer on 10/24/23, pending manufacturer availability. The reason is that the 706 heads are SPM (semi-permanent mold) made, while the 862 heads are sand-cast. If you go for a pair of PRC cnc cathedral port heads, you need to swap over that vic jr …. Shop Cylinder Heads at Summit Racing. The SPM method is considered to be a more consistent process, but once you port the 862 head, any difference to the 706 head goes away. The Generation have a "rectangle" port. Since the factory L92 cylinder heads were released, one of the hottest topics has been how to convert older (cathedral port) LS-series combinations. Low valve angle heads in the 7- to 12-degree range with port heights of 1. 0 with LS3 engine combination. With that, we packed up our heads and shipped them off to Lingenfelter Performance Engineering (LPE). The TPS part number is 17123852. Best Stock Ls Heads For, 706/862 Heads Cylinder Head Pair Remanufactured CNC Ported LM4/LM7, 199-2014L83PkgCust Texas Speed Performance CNC-Ported Gen L83 L86 Heads Camshaft Package Customer-Supplied Heads Texas Speed PRC As-Cast Cathedral Port 220cc Cylinder Heads LS LM7 L59 LC9 LR4 L33 LH6 L20 LY2 LMG …. We also liked the fact that the cam test on the 5. The aluminum 862 heads are a lightweight choice for engine design. 2 LS3 Rectangle Cylinder Heads 6. 660" Spring Kit and Titanium Retainers $ 1,836. 232cc Full CNC Porting Package. I also believe there were 706 non castec heads as well. They are commonly utilized in high-performance and race cars because they provide superior fuel economy. The 317 replacement costs seem to range from $150-$300 per pair. How much hp can stock LS1 heads make? Do ported stock heads make. Tick Performance Turbo Stage 2 Camshaft for LS3 & L99 Engines. However, their thin cross-section allows for high speed and smaller volume runner design with excellent flow. They offer good power and are compatible with many different engine types. 6 Intake port volume: 280 cc Exhaust port volume: 97 cc Chamber volume: 70 cc. The new 237cc port has been flow bench tested to flow over 330cfm & can support everything from smaller camshaft street engines all the way to race engines. AFR, LS1,LS2, Cathedral Port, Aluminum Heads, 230cc Intake Runner, 62cc Combustion Chamber, 2. com FREE DELIVERY possible on eligible purchases. Mast's big cathedral port heads feature a 295cc intake port volume, 69cc combustion chambers, and are set up to accept LS7-style valvetrain components. L83 CNC Cylinder Head Porting Service $ 1,009. What LS did 862 heads come on? When it comes to the GM's LM7 engines, the 862 cylinder heads are an integral part. PRC CNC Porting/Machining Service Includes:. As long as the intake manifold you are using is designed for cathedral port heads, you will be fine. CNC Worship: Inside Lingenfelter's Ported 243/799 Cathedral Heads. I have 862's on my 99 which I have owned since 01 and never have had problems. Upgrading the LY6 and L96 Engines. Meanwhile, the 862 heads are … See more. 00 Select options; 243/ 317/ 799 CNC Cylinder Head Porting Service $ 900. The cathedral-roof shape at the top accommodates the fuel-injector path. 590, as well as a peak flow of 223 cfm and 317 cfm on both the. 832-619-1622; Our 706 & 862 ported heads include: Our in house CNC port; PCD surfaced to your desired chamber size; Proprietary competition valve job;. But again, porting costs cash, so 706 heads are the best choice to cast in …. Free Shipping - Trick Flow® GenX® 225 Cylinder Heads for GM LS2 with qualifying orders of $109. 243 Heads: All About 243 LS Heads & Their Application. ” However, their thin cross-section allows for a high-velocity and smaller-volume runner design with excellent flow. The 87mm throttle body is adequate for most power levels. GM LS1 Gen III / IV Cylinder Heads 862 BIG VALVE LS3 Springs Compression Milled. The 243/799 cylinder heads come with a 2. LSXrt 102mm Intake Manifold for GM LS 4. 90 views, 9 likes, 0 loves, 2 comments, 0 shares, Facebook Watch Videos from Arlington Machine: 862 Cathedral port LS heads on the bench about to get assembled on these heads we started off by. 1999 to 2006 Sierra : 1500,2500,4. The cathedral-shaped intake port and oval-shaped exhaust port on the 5. Part Number: 12559852, 12561706 ,12559862. Notes:Casting # 704-1 or Casting # 476-1. The chamber sizes varied from a low of 64 cc for the cathedral-port AFR 245s, 70 cc for the stock LS3 heads, and a high of 73 cc for the 317 heads. 890 inc, an exhaust valve diameter of 1. Despite numerous differences the Gen III LS Engine and Gen IV LS Engine cylinder blocks share a lot of the same traits. 245cc LSX Mongoose Strip Aluminum Cylinder Heads. Welcome to LSXceleration! LSXceleration, LLC 13528 US 51 Atoka, TN 38004 United States of America (cathedral port) cylinder heads. With superior airflow capabilities due to its large intake runner volume and high-flowing exhaust ports, the 243 casting allows for more air to enter and exit than any other stock cathedral port heads on the market today. Bore w/63 cc Combustion Chambers XXTREME Bare 255 cc Cathedral Port Cylinder Heads for LS1, LS2 w/4 in. 000" (+) Bore - Pair Black Label CNC Cylinder Head - Stainless Steel or Titanium Valves. The 862 and 706 casting Cathedral-port cylinder heads can be CNC-ported to flow close to the aftermarket heads. The intake port is where the flow begins. 660" Dual Spring Kit w/ PAC Racing Polished Springs, Titanium Retainers, Hardened Spring Seats, and New Valve Stem Seals. The larger intake port design works very well on the 6. Trick Flow® GenX® 220 cylinder heads for GM 5. LS Cylinder Heads – Mast Motorsports. They had cathedral port cylinder heads and used Active …. PRC 237cc CNC Ported Cylinder Heads $ 2,912. Description: CNC Ported LM4/LM7 706/862 Cyl Heads. Most importantly, 862 LS are readily available in the market and the port. Katech - KAT-M7107 CNC Port LS1/Truck 862, 706 Cylinder Heads (. They flow great, and the cross-sections are great. Designed to work on Gen III engines like the LS1 , LS6, and LS2, it offers a good torque balance, making it great for street use. The engineers at FAST teamed up with the airflow specialists at RHS to develop a 3-piece, polymer intake manifold. These heads deliver an increased flow of up to 32. LS 862 heads Raising the Roof Exhaust. Some popular camshaft choices for the 5. 7/1 comp, 243/258/110 comp cam with. 55” valves and porting them to 215cc/82cc ports. Free shipping on many items REBUILT 4. Armed with the right knowledge, the correct tools, and a. 4 block and the cathedral port heads from the LS6. We have a few options you can purchase such as a pair of Stage 1, Stage 2, Stage 3, or Stage 4 LS 243/799 Cathedral casting 5 axis CNC Porting with stainless valves and WP. They feature large intake and exhaust ports that flow an impressive amount of air, making them ideal for high-performance applications. Designed as a bolt on cylinder head with minimal change to pushrod length. Cathedral Port Cylinder Heads; LS3 Cylinder Heads; LS7 Cylinder Heads; Dart 10 Degree LS Head; DOD/AFM Delete; EFI Systems & Accessories. For perfection, GM installed an intake valve diameter of 1. 0L engines had cathedral port heads, the LY6 and L96 came with high performance rectangle port heads. This gives you a head start on the project without spending big money up front. 3L out of a 2007 Silverado with 70k miles for $650. Thanks to CNC porting, the AFR heads flowed nearly 360 cfm, meaning they would support over 700 hp. 1 product rating - DART CNC PORTED 250CC LS1 LS6 CATHEDRAL PORT HEADS # 11071040. 862 heads are cast on sand molds, but 706 cylinder heads are cast on a semi-permanent mold. 00 Select options; 706/ 862 CNC Cylinder Head Porting Service $ …. $5 Off Your $100 Mobile App Purchase - Get the App. Ultimate LS 1000 HP EFI System With Long Runner Cathedral Intake. These heads join their existing pair of cathedral port castings: 215cc 11-degree 3. The 862 heads are on GM’s LM7 engines and feature an aluminum construction, a 61cc combustion chamber volume, a cathedral-shaped intake port, and an oval exhaust port. The simplest way to classify the LS family of heads is into two categories: early cathedral and later rectangle port heads. 3 heads should have bumped you up to 10. Get Out of the Junkyard, Get On with the Build with RHS Pro Action LS3 Rectangle Port Heads! Available bare or assembled with premium COMP Cams valve train components, these LS Rectangle Port heads are engineered with the same architecture as the factory head, and all stock components will fit without issue. They need different gaskets than "normal" LS heads and the gaskets that came with the engine was MLS and did not fit the 853's. High performance premium cylinder heads and components for LS & LT applications. 125-inch-or-larger bore is required. ---->Download the cylinder head spec sheet<---- The Mast Motorsports cylinder head product line is completely manufactured from a raw casting to a finished cylinder head in the USA located in Nacogdoches Texas. They had cathedral port cylinder heads and used Active Fuel Management (AFM). 0L Truck with Cathedral Port Heads. 0L truck engines, as well as the Corvette ZR1's LS9 and Cadillac CTS-V's LSA supercharged engines. 3 GM 862 SINGLE HEAD CATHEDRAL PORT OEM #C118. PRC As-Cast 225cc LS1/LS2 Cathedral Heads - Big Chamber $ 2,203. Free FAST Shipping, Free Returns, Expert Tech Support. 0 Iron center bolt heads 317 01 and up LQ4 and LQ9 6. Will Rectangle Port Intake Work on Cathedral Heads? The rectangle port intake will not work on. Equipped with the adapted LS2 intake, the LS3 test motor. $5 Off Your $100 Mobile App Purchase Trick Flow GenX® 225 cathedral port cylinder heads are fully CNC-machined to significantly increase the performance of 6. Test 8 West Coast Racing Cylinder Heads CNC LS3/L92 Retail price: $2,180 Intake valve size: 2. Tim hotchkiss says: Wanting to rebuild another 6. I believe you need an even larger bore like the LS7 has for those Warhawk heads. Skip to content including a cathedral-shaped inlet port with an oval outflow port. The assembled versions feature either dual or Beehive Valve Springs, chromemoly steel re. The actual difference lies within the compression ratio of the two. 0 aluminum center bolt heads 035 01 - 04 LQ9 6. The 245 AFR heads offered exceptional airflow (more than we needed), though the chamber size was likely better suited for a larger 4. However, the research process can be made significantly easier by narrowing down your options to a specific model. The L33 is basically a baby LS6 with a truck intake. The raised rectangle intake port design can be found on the LS7 and LSX engines. The most commonly-used intake port is the cathedral port. Home GM Drivetrains 04 - 06 GTO C5 Corvette C6 Corvette NEW 4. 243 heads have a flow profile that makes them more adept at boosting torque on LS6 builds than LS1 since the …. The heads use a standard LS 15-degree valve angle with a 1. This attribute contributes to improved fuel economy ratings while dissipating heat more . 3L CYLINDER HEAD 862 CATHEDRAL PORT OEM · C $204. 243 Vs 799 Cylinder Heads: What's The Difference?. The 243 head features a unique D-shaped exhaust port that is designed to improve flow and boost performance while its cathedral-shaped intake ports help increase air velocity which can also lead to increased power output. AFR’s 245cc LS1/LS2/LS6 “Competition” ported heads feature 100% CNC ported intake, exhaust & chambers, A356 aluminum castings, Titanium retainers and high quality components throughout. We have a few options you can purchase such as a pair of Stage 1, Stage 2, Stage 3, or Stage 4 LS 706/862 Cathedral casting 5 axis CNC Porting with stainless valves and WP. 600 lift), but shared the 70cc chambers to keep compression consistent. Find Parts and Accessories ls1 cathedral port heads KEYWORD and get Free Shipping on Orders Over $109 at Summit Racing!. The factory cathedral-port heads used on the Gen 3 motors (LS1, 2, and 6, along with multiple truck variants) might not flow as well as their rec-port counterparts, …. T intake and a stock LS2 intake for the cathedral heads. 3L engine The 823 rectangular port heads feature a lightweight valve combination of 2. The cathedral port maintains a higher velocity at the lower rpm range and will. Cylinder Head Bolt Style: Torque to Yield. 0L truck engines came with cathedral-port heads. These are Castech heads also, and are/were prone to cracking. 243 or 799's are the ones to look for, they flow more and increase compression therefore you wouldn't have to mill. The castings of cylinder heads are similar to that of 706 heads. 3 Liter Truck Material: Aluminimum …. Product Home Products 706/862 LS CNC Ported Heads 706/862 LS CNC Ported Heads $ 1,100. 3L was run with ported cathedral-port heads, while this 6. 625-inch-diameter springs, and several are available. These heads, and the accompanying FAST LSXr intake, offer excellent velocity and port flow. These Trick Flow GenX® 225 cathedral port cylinder heads for GM 6. ProMaxx Performance 3140: XXTREME Bare 245 cc Cathedral Port …. I am not very supportive of semi-novice hand head porting of …. Oversized Stainless Steel Valves. Holley GM LS Gen III & IV Dual. 243 heads have cathedral intake ports and D-shaped exhaust ports. PRC CNC Porting Service - Cathedral Port Heads (Customer Supplied Castings) - PRR-199-CathedralPorting The price listed is for you sending your cathedral port cylinder heads (4. I have the chance to grab a zo6 intake right now for 175 bucks--its off a 2006 zo6 corvette--the heads I have on the side are cathedral port 862's-is there a chance these can be combined? also--even if they don't work together--is 175 a. 600 Exhaust Valve, Designed for 4. You are much better off with the 706/862 heads from a compression standpoint. These large-runner heads have a 12-degree valve angle, like stock, and are compatible with factory LS7 rocker arms and stands. The LS2 engine also features cathedral-port heads but is technically considered a Gen IV engine due to the change in cam sensor location. If you go for a pair of PRC cnc cathedral port heads, you need to swap over that vic jr with at least a super vic, or fast102. Also, the port velocity on the 706/862 head is much better than . PRC CNC Porting Service - Cathedral Port Heads (Customer Supplied Castings) $ 899. gm ls 706 806 862 241 799 862 243 cylinder head rebuild service 3 buisness day. Cylinder Head Bolt Style: Torque to Yield (TTY) Torque to Yield (TTY) Cylinder Head Bolt Size 1999-2003. 0L engines with cathedral port intakes including the LS1 LS6 LS2 LQ4 LQ9. Edelbrock Chevy Gen III LS1/LS2 EFI Intake Manifold Single Plane Cathedral Port 28095. Intake manifold bolt patterns are. 862 heads pulled from running motor. ProMaxx Performance 3141P - XXTREME Assembled 245 cc Cathedral Port Cylinder Heads for LS1, LS2 w/3. So, this means that in this example, I would have to open the intake valve 3 degrees later with the square port heads to equal the same piston to valve clearance as my PRC CNC LS6 heads assuming a flat top piston like the OP's LQ9. Welcome to LSXceleration! LSXceleration, LLC 13528 US 51 Atoka, TN 38004 United States of America Designed specifically for GM 4. The short-block was originally fitted with a set of LS3-style rectangle port heads, but we since have converted to a set of smaller, cathedral port Trick Flow Specialties heads with a 225cc intake port volume. Run with the 317 heads, the modified 5. This 100% CNC ported head utilizes 2. 226 cfm intake, 174 cfm exhaust. A popular upgrade to the LQ4 and LQ9 is to install a set of LS3 heads and intake. What LS motor has 862 heads? these are the best performing of the OEM cathedral ports. If you have a Z, you already have good heads, with lightweight valves, so you can send them to TEA, and get them modified, and save some cash. I wouldn't put the 862 heads on a 6. General Motors has three different designs for the LS engine: cathedral port, rectangular port, and raised rectangle port. Intake Port Shape Design: Cathedral: Cathedral: Exhaust Port Shape: D-Port: D-Port: Exhaust Valve Diameter: 1. My plan is to rebuild the spare block from the inside out with all new bearings, BTR "Torque" cam, Weiand aluminum intake, and then port/polish the heads. 243/799s are the best cathedral port stock heads when it comes to flow and since . 2L engines, this port shape is also used on LS3 engines and some 6. The Generation 3 heads have a "cathedral" port. AFR 210cc LS1 Enforcer Cylinder Heads 1501. Unleashing the Power of LS2 Heads: Everything You Need to Know. Afr's max effort cathedral port head for the LS / LSX platform is recommended for race applications or radical "Pro Street" builds with displacements up to 454 cubic inches, operating at or below 6800 RPM. Cylinder Head Port Design. They reduce down-time, they’re all new, and you can usually offset the added cost by selling your original heads. The low-profile manifold mounts a 92mm, cable-actuated throttle body. The LS7 is the lone wolf in the entire lineup, with a wider bolt pattern and larger intake ports, so there’s no interchangeability. pair of mace bare cathedral port 243 casting cylinder heads for hsv ls2 6. Precise computer controlled CNC machining, multi-angle intake. Nevertheless, Mast recently introduced a brand new pair of 12-degree cathedral port heads in 275 and 295cc intake port sizes specifically for big bore (4. lt1z · #2 · Feb 8, 2013 (Edited) If you are comparing GM castings then a cathedral port like a 243 will need to be ported to match a stock LS3 on the intake. Mulled to true the deck surface only. LS7, LS3, and LS9 Cylinder Heads Earlier Gen III LS heads, such as those found on LS1, LS6, and various Q Series truck engines, feature tall intake ports referred to as “cathedral” ports. Their impressive airflow characteristics makes them a solid choice for a mild performance build right out of the box, but for those who’re looking to really. The LSR Cathedral Port camshaft series is an exceptional choice for those who have aftermarket cathedral port cylinder heads and higher compression in their high RPM, race-only LS engines. Camshaft -TSP 220r Valve Springs - TBD Valve Seals - TBD Intake - Dorman 615-183 Heads - Port and Polished stock heads Stock Crank Lifters - Chevy even with 4. 0 but use 862 heads to bump up the compression, but, if at all possible not be relegated to using 92 octane. 5 cfm on the intake and exhaust ports and a horsepower boost of up 20 hp. 706 & 852 & 862 Head: 1999+ LR4 4. 706, the 862, and the 706 heads are awesome vehicle cylinder heads. Shooting for a good 500 hp street build. The SPM method is a more consistent process, but porting 862 heads nullifies the difference between them. With advanced porting (such as those. I am wondering in terms of in this thread in this sub-forum in the entire site. 04-06 pontiac gto passenger side rh kick panel #3271. 780" (+) Bore - Single Black Label CNC Cylinder Head - Bare. While the 862-cylinder heads are best suited for high-performance or racing cars, they can be seamlessly attached to most cars on the roads. 210CC LS1 ENFORCER CYLINDER HEAD. Speed Works has teamed up with Wilkes Performance to bring you the most powerful heads available. thinking about building these (port n polish, roller rockers, valves n springs to go with a nice cam) to put on my 06 gmc 4. All heads come with high quality components, such as titanium retainers and Pac Racing Springs. These LS cathedral port heads are engineered with the same architecture as the factory heads, and all stock components will fit without issue. 00" Bores in a N/A Setup, at least in my …. These camshafts are designed to provide excellent low-end torque, mid-range power, and a noticeable increase in horsepower. These heads also have thick decks and strong valve springs, so they. The Definitive Guide to LS Engine Specs and LS Engine Upgrades. (Photo Courtesy AFR) The LS3-style head features 12-degree valves and 260-cc intake runner volume. Convert from Cathedral to Rectangular Port. You will also be getting a larger bored engine which should help the heads flow better. Will Rectangle Port Intake Work on Cathedral Heads? The rectangle port intake will not work on cathedral heads. Anyone done a head swap on the 5. These gaskets are specifically designed for the 2001-earlier LS1, 4. I did a 408 cube ls using a cathedral port head. The new PRC as-cast intake port has been flow bench tested to flow over 320cfm & can support everything from smaller camshaft street engines all the way to all out race engines. Premium Materials - Manufactured using RHS Clean Cast Technology, RHS Pro Action LS3 heads feature a smoother internal surface finish and no casting flaws. The intake port is shaped in a classic cathedral design while the exhaust port. This assembled pair features dual valve springs, chromemoly steel retainers, heavy-duty stainless steel valves, and top-quality valve seals – all inspected and assembled by qualified Edelbrock technicians. You can't mount the cathedral port intake to a non-cathedral (square - L76, LS3, etc) port head. For more details and information. 10 *This camshaft is specifically designed for use with single plane intake manifolds such as Victor, Hi-Ram, Mid-Ram and GMPP intakes. Sensible HeadsPerformance Racing Industry. 862 heads being setup on a Max effort Pump Gas LS1 build. 00in valve installed and you got a good flowing head and higher compression for cheap. I have the final bowl cut percentages and volumes for Intake port, Exhaust port; Combustion chamber. For 2006-2016 GMC Sierra 2500 HD Cylinder Head Diamond Advantage 32664RJ 2007. These well-engineered ports optimize airflow, ensuring your engine breathes effortlessly. The 862 heads are inferior to the 706 heads in terms of compression, and they don’t also flow well like the 243 heads because it doesn’t have other competitive features; however, depending on your …. This head has been designed on a 13. Are they all cathedral port heads? What RPO engines are the heads Both 853 and 862 have cathedral and same port volume. the Key to cathedral vs Rectangle port. Bare or Assembled – Frankenstein Engine Dynamics OEM and Aftermarket Cylinder Head Performance Porting. The difference between these heads are simple, the amount of cfm the heads can flow determine how efficient …. Obviously, the difference in chamber volume would alter the static compression ratio by as much as one full point between the AFR 245s and the stock 317s. 0L cathedral port cylinder head-equipped truck engines and cathedral port LS1, -2, -6 146602B Add to Cart. The Enforcer heads have a 210cc intake port volume along with an 82cc exhaust port volume. The LS3’s 319-T5 aluminum alloy cylinder heads use 2. We would like to show you a description here but the site won’t allow us. 570 exhaust with an intake flow of 305cfm and an exhaust flow of 220cfm Our 706 & 862 ported heads include: Our in house CNC port; PCD surfaced to your desired chamber size; Proprietary competition valve job 11 Degree Cathedral $ – $ Select options; Small Bore CID. The hard part was the manifold but Whipple has the cathedral port manifold now so we should be seeing a kit soon. 862 heads are one of the most high …. The 706 is easier to get higher compression out of unless the 241 has the chambers welded up and is then CNC'd. Component upgrades and different machining. This means that the valves will be closer to the cylinder walls. After swapping in the rec-port 54-469-11 cam, the peak numbers changed to 560 hp at 6,700 rpm and 481 lb-ft of torque at 5,400 rpm. 5° valve angle paired with nitrous/boost friendly combustion chambers that fit existing pistons. BRODIX is the undisputed leader in big block Chevrolet compatible technology. JE Pistons Piston Single, 4032, Inv Dome/Dish, 4. Bought this little Chinese made valve spring compressor for cathedral port LS heads. 3L, aluminum engines also had cathedral port heads, similar to the LS1, LS2, and LS6. Casting number 862 or 706 heads were used and sported a 61cc chamber but had tiny 1. The LS2 engine also features cathedral-port heads but is technically considered a […]. Stroker LS Cam Swaps: When is Bigger Not Better?. Air Flow Research 245 LS head will help you deliver big …. 000" (+) Bore - Pair Black Label CNC Cylinder He – Mast Motorsports. The interesting part about this article is that the math is there to support the claims and it's available for anyone to use with any cylinder head they have data for to. klein tools 69417; ken the barbie doll man;. Track vid: link Dragzline Feature: link Chevy High Performance Mag Feature: Heads are Edelbrock 245cc cathedral deals that I believer were cnc'd by WCCH a long time ago. Although the design is meant for high-performance settings, it performs well in the Avalanche, Express, Silverado, Sierra, Yukon, and other trucks or SUVs from the late 1990s to about 2007. The next place to look for extra power is the cylinder heads, especially when running the cathedral-port examples. Are 243 heads Cathedral port?. WILL SHIP DIRECTLY FROM MANUFACTURER ESTIMATED SHIP DATE: TBD. 862 Heads The Chevy 706 LS Heads are semi-permanent mold (SPM) made and superior to the most common 862 heads, which are sand cast. This means that, while both sets of heads have the same valve size and port chamber cores, the 862s will generally have a higher compression ratio. The 317 heads flowed more than the 706 heads by as much as 20 cfm at some lift points. 862 head pulled from running motor. These powerful cylinder heads can be found in trucks, SUVs, vans and many other performance applications due to …. 3 gm 853 head set cathedral port loaded cores oem #c57. Chevy LS V8, Cylinder Heads in-stock with same-day shipping. Also, this guide does not cover the supercharged LSA and LS9 intakes, since they’re an. The 706 heads, however, feature an intake valve size of 2. The Vortec heads are cathedral offerings, as they are almost always in stock and sell out quickly. 3, LS1, LS6, LS2, LQ4/9) to us for porting. Converting from Cathedral to Rectangular Port. You'll lose compression if you use cathedral port 6. NEW ONLINE STORE!!!https://lsnasty. 5-degree more timing than the LS3-headed engine, with very similar timing curves,” says Neelan. To produce the power these heads are noted for, the head has a very large intake port (257cc, 2. The Gen III cathedral port heads get their moniker from the tapered upper portion of the port that allows the fuel injector to aim directly at the back side of the intake valve. From Spencer, Massachusetts, United . Drivability: Great driveability with an amazing chop! Dyno Test Motor Specs: Stock Gen IV 5. Gen III/IV LS Engine ID Guide. There is no reason to put the weaker 862 head on an L33 when the engine comes with the best flowing cathedral port heads GM made. 2+ liter displacement, and maximum engine speeds of 6000-7000 rpm, depending on. Chevrolet Car and Truck Cylinder Heads and Parts. 3 GM 862 HEAD SET CATHEDRAL PORT LOADED OEM ; nextgen_partsplace (1369) ; Est. if i recall correctly the difference in flow isnt a lot. 862 Heads are the best for compression due to their ability to control the input and output of airflow into the cylinder heads. Additionally, the 862 heads come with an oval exhaust port that efficiently …. Our fully CNC'd 706 or 862 heads give you an aftermarket 2. 39 posts Previous; 1; 2; 3; Next; ap72 Guru Posts: 1638 Joined: Wed Mar 04, 2009 1:31 pm Location: Re: LS 862 head porting. Multi-port (136) Throttle body (14) Direct injection (3) Get Results; Basic. Free ShippingLoading Estimated Ship Date: Today. They are as follows: Frequently encountered. Heads: Everything You Need to Know">Unleashing the Power of LS2 Heads: Everything You Need to Know. The LS4 cylinder heads came with two casting series numbers - 799 and 243. 5:1 Recommended Headers: 1 3/4" - 1 7/8" Recommended Stall Converter: 5500 (on nitrous) Recommended Rear Axle Ratio: 3. What makes these heads so desirable is their superior casting and improved airflow due …. Our high end machine work applied to GM's best cathedral head represents a phenomenal value to enthusiasts and serious competitors alike. But how would the cathedral-port heads. AFR 1501 LS1 210 Enforcer Heads, Cathedral Port, Assembled. No, the Cathederal port heads are tinker toys compared to the LS3 heads. General engine tech -- Drag Racing to Circle Track. Factory converter friendly! Stock 862 heads with GM LS6 Valve Springs,. Edelbrock E-Street LS Cathedral Port Cylinder Heads are manufactured with premium material and machined to the industry’s tightest tolerances. The 706 Vortec heads are even slightly superior to the commonly found 862 heads. The 706 heads are superior to the 862 heads because they are semi-permanent mold (SPM) made. It was the 243 casting, but I don't think there is a big difference in potential. 0L (cathedral port heads) ***CANNOT SHIP TO CALIFORNIA DUE TO EPA & CARB LAWS - ORDER WILL BE CANCELLED IF YOU ARE IN CALIFORNIA*** Introducing the CHOPacabra cam! This is a nasty little beast of cam. 070 and don't plan on turning more than 7000-7500rpm run a 235-245cc cathedral port head as it will make more torque than the rectangle port head will. performance_parts21 (333) 100%. Requires 4" bore minimum and LS3 intake …. 660 dual race springs with WP titanium. 706 or 862 heads: which is superior? The SPM (semi-permanent mold) method is thought to be a more consistent process, and the 862 heads are sand cast, so …. 3-liter Truck Material:Aluminum Part Number: 12559852, …. The intake valve are monsterous and so is the intake port @ 255cc. 3 GM 862 SINGLE HEAD CATHEDRAL PORT LOADED …. Victory titanium intake valves. The 862 heads are inferior to the 706 heads in terms of compression, and they don’t also flow well like the 243 heads because it doesn’t have other competitive features; however, depending on your car’s needs and budget, the 862 cylinder heads might be a good port for you. They are the rectangular higher flowing heads, the LC9 5. This camshaft is an excellent choice for enthusiasts who want to hotrod or race a stock short. Most good performing LS3 cams are going to have more split. Aluminum After Market Cathedral Port LS Cylinder Head (SIMILAR to GM 243 Head) Opens in a new window or tab. LM7 Cylinder Head Specs; Casting Numbers: 862, 706: Material: Aluminum: Combustion Chamber Volume: 61cc: Intake Port Shape: Cathedral: Intake Runner Volume: 200cc: Exhaust Port Shape: Oval: Exhaust Runner Volume: 70cc: Intake Valve Diameter: 1. please see pictures for condition ALL CYLINDER HEADS HAVE BEEN ULTRA SONIC CLEANED Home › 4. When looking to increase the capabilities of an LS cylinder head, typically CNC porting goes a long way to improve airflow, as well as changing the valves. 0 gm 799 heads set cathedral port loaded oem #c111. 862 Heads what are they ? Archives. When it comes to high-performance cylinder heads, 862 LS Heads are the best option. It made good power for a pump gas street engine. Buy DEMOTOR PERFORMANCE Intake Manifold High Profile 102mm Throttle Body Aluminum Sheet Metal Fits Cathedral Port LS1/LS2/LS6 Black w/Fuel Rail Kit: Intake Manifolds - Amazon. Fits GM LS1, LS2, and LS6 cylinder heads with cathedral intake ports. The thing of the square port is that they tend to make good hp up high in the rpm range and the cathedrals tend to make good power at. Many truck heads built in small factories are known to drop the engine’s compression, but 706 heads are not one of them. 8L LM4 engines had displacement on-demand, active fuel management, or variable valve timing. In most regards, the 862 heads are nearly identical to the 706 heads. But I just read an artical in GM high tech that an aftermarket set of cathedral heads flow just as good as stock ls3 heads but the cathedral heads have better low end flow. 862 casting cathedral port ls heads. First set of 862 ls cathedral port cylinder heads being machined by KPE ,ports designed by Chad koch. ALL Gen III heads are interchangable. Re: Proper Camshaft Design for a Cathedral Port, STREET, 427 LS Engine. ProMaxx Performance XXTREME Bare 245 cc Cathedral Port Cylinder Heads for LS1, LS2 w/3. 95geo said: The story is I bougth a LS1 (in parts) with 853 heads. nastyLS Nasty700 N 13th StErwin NC 28339S. A better option is aftermarket cathedral port heads. 5 cfm on the exhaust ports, resulting in a horsepower increase of 20 hp or more. What you need to know: These small combustion chamber truck …. Designed for: LS3, L92, LY6, L76 and L99 Engines with Square Port Heads (as they're equipped with stock) Basic Operating RPM Range: 2000-6600. Just s description of the differences between rectangle port and cathedral port 4. The design of the intake and exhaust ports in 706 cylinder heads is nothing short of meticulous. For a street car, this design means excellent throttle response, torque and average power. PAIR OF MACE BARE CATHEDRAL PORT 243 CASTING CYLINDER HEADS FOR HSV LS2 6. LS Engine Tech: How To Improve Flow With Easy Chamber …. Bore w/63 cc Combustion Chambers (0). This allows the valves to seal …. The cylinder heads are composed of aluminum and have a 70cc exhaust runner volume. We discuss the performance, flow rates, and compatibility differences with different engine build. 3 gm 862 single head cathedral port oem #c68. Ultimate LS Rectangular Port Cylinder Heads Guide. This Cylinder Head has a core charge of $200. Below are some upgrades that …. Chiphead · #2 · Jun 8, 2016 (Edited) The heads with the casting flaw were the 706 castings made by castech from 2000-2005. BES / All Pro Cathedral Port Heads – BES Racing Engines. Put a set of ported LS3 heads on a flow bench vs a set of ported 243s or an out of the box AFR/TFS cathedral port casting.