862 vs 243 heads

doing math an saying you have 2cc worth of valve notchs i got you around 12-1 comp wise with the 58.5 in for head cc an pistons out .006..with the 60cc 243s i got you at 11.8-1 with 2cc notchs,.006 out and .040 gaskets..hope this helps. I had them actually cc'd after I removed em.. 61.5.. Steve. 408, th400, 1100rwhp..

PRC LS3, L92, & LSA CNC Cylinder Head Porting (Customer Supplied Castings) $ 899.99. Cometic Ford 5.0L Gen-1 Coyote / 5.2L VOODOO Modular V8 Intake Manifold Gasket Set $ 29.23. Cometic Ford 5.0L Gen-1 Coyote Modular V8 .027" MLS Cylinder Head Gasket, 94mm Bore, LHS $ 132.74. Military And Law Enforcement Discount . CONNECT WITH US.1713 posts · Joined 2004. #5 · Apr 14, 2021. I have stage III ported 243 ls6 heads and cam on my LS1. Great setup, you should pick up some HP. 2004 GTO - Quicksilver A4 (437rwhp 371rwtq) Engine Mods: Livernois Stage III LS6 heads/cam | Cam - [email protected], Lift .568", LSA 114.Do you know what a Phillips head screwdriver looks like? Find out what a Phillips head screwdriver looks like in this article from HowStuffWorks. Advertisement The Phillips head sc...The LS3 was run with a Holley HP management system and FAST injectors. With stock heads, the modified LS3 combination produced 552 hp at 6,400 rpm and 513 ft-lbs of torque at 5,000 rpm. After installation of the TFS Gen X 255 heads, the power numbers jumped to 571 hp at 6,500 rpm and 525 ft-lbs of torque at 5,200 rpm.Part 6 of the LS 5.3L Build will cover Installation of the 862 Aluminum Heads, Lifters, Pushrods, and Rocker Arms. Project Rowdy is a restoration on a 1979 J...Go with the 862s for 3 reasons: Smaller combustion chamber will have a slightly higher compression ratio. If it's your first time porting you may as well fuck up the heads that have a lower resale value. differences in horsepower just aren't going to be a whole lot between the two once ported.862 is a 5.3 liter head. Smaller combustion chamber (61.5CC), increased CR. 241 is a 5.7 liter head. Larger combustion chamber. Gains from a higher ration rocker arm (1.8 vs 1.7) are going to be minimal. Expect approximately 10 peak HP. IMO, if you have any plans of adding a aftermarket camshaft later down the road, pass on the 1.8 ratio rockers.Previously, we compared the stock 706/862 heads to the 799/243 heads on a cammed 5.3L test motor. There was much uproar among 799/243 head enthusiasts. Than...

Great cylinder-head airflow has been a key enabler of the LS-Series' exceptional performance. Chevrolet Performance delivers those power-building attributes to you with a range of production-style aluminum heads — from the LS6 heads for smaller-displacement engines to LS7 style heads for 427-inch-and-larger combinations, our aluminum heads benefit from Chevrolet Performance's extensive ...Description. LS1 LS2 CATHEDRAL PORT - 243 CYLINDER HEADS. Sold as a Pair - Bare. Machined - ready for assembly. Suit the 5.7ltr and 6.0ltr. These Cylinder heads are a High-Performance replacement to the GM 243 heads. All factory mounting points with the Performance of the 243 port and chamber. You can use your existing valves & springs.HOW MUCH POWER ARE PORTED HEADS WORTH? HOW MUCH POWER ARE REC-PORT LS3 HEADS WORTH ON A 6.0L? DOES A 408 STROKER NEED BIGGER HEADS? CAN I RUN 317 HEADS ON MY...Where the stock 243 heads featured 65cc chambers, the 317 heads featured 72 cc chambers. The 317s were given the nod over the 243 since they offered the larger chambers that most closely duplicated those on the LS3 (71cc). The biggest difference between the 317 cathedral-port heads and the LS3 heads was the port shape and …243 04 up LS6 aluminum center bolt 5.7 ***These castings were also used around 05 in truck applications*** 862 99 and up 4.8-5.3 Truck heads . 706 99 and up 4.8-5.3 Truck heads. 799 05 and up 4.8-5.3Truck heads ***reportedly came on a few corvette's too*** These are basically 243 Heads. 873 99-00 LQ4 6.0 Iron center bolt headsThe 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.The price difference for 799 an 241 heads is because the 799 is a twin to the 243 an have better ports an 64.54cc chambers where the 241/853s have not as large of a port an are 67cc..your 862 is actual the smallest chamber head being 62cc but their down side is smaller valve size an slightly less flow then 241/853 heads..

GM 243, 799, & 317 LS2/LS6 Options: Performance Rebuild Package Our Performance Rebuild option includes our high end CNC'd valve jobs, precision valve grinding, milling to any chamber volume, cleaning, inspection, and professional assembly. Typical gains are 10-20rwhp. 226cc Full CNC Porting Package The go-to head for 450-500rwhp 5.7/6L's.Apr 16, 2013 · 862 s Vs 243 s..... So what the difference between some milled 862s and some stock 243s? Also how big of a difference would the 243s and a nnbs intake do on a 2003 4. ...On our Mast heads, the LS3 head offered both more intake and exhaust flow than the cathedral-port heads, resulting in an intake-to-exhaust flow percentage (372/261 cfm) of 69.89 (meaning the ...The biggest difference between the Stage 1 and the Stage 2 is the use of larger Ferrea valves and accompanying valve job, which was developed on the Trick Flow Specialties (TFS) 215-cc head. Just like the Stage 1, the 243 or 799 casting receives full CNC porting of the runners and hand blending of the port and valve job.862 vs 706 Heads. The Chevy 706 LS Heads are superior to the most popular 862 heads, sand cast, and produced using semi-permanent molds (SPM). ... Due to their better ports, 317 heads are frequently preferred over 243 and 799 heads, two more expensive models. However, the bigger 71.06cc combustion chambers of 317 heads will reduce …The 317s slightly larger runners and valves won't give you 4%. So if we were talking NA, I would agree the 862 would make slightly more power than a 317. Once you add a turbo though everything changes. With that 1pt of compression drop you can add a good 5-7psi.

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Compression Ratio. The 862 head has a smaller combustion chamber as compared to the 706 engine head. It is due to this difference in the size of the combustion chamber that the compression ratio of 862 is higher. This slightly improves the engine performance and the 862 engine head seem to be standing at a better pedestal as compared to the 706 ...The 5.3L was run once again in stock trim with a single S480 turbo. Run at a peak boost pressure of 9.6 psi, the turbocharged 5.3L produced 532 hp at 5,500 rpm and 555 lb-ft of torque at 4,700 rpm ...Is it worth it to get them cnc'd vs having the ls1 heads cnc'd? I thought the 2004 GTO had 243 heads My ride is a 2002 Camaro SS SLP #3296 with 30k, LTH, 3" Y, CME, Frost tune, K&N, ported TB, Blackwing lid, Bellows, MSD, Denso Iridium, and 85mm MAF, Bilsteins, Eibach springs, SLP strut brace, Adj. Panhard, TA Girdle, UMI, Pro 5.0, Nitto …799 vs 862 heads which is better? I have a 99 5.3 that's going in my 02 silverado that currently has a 4.8 and the 5.3 has 862 heads and I found a set of 799 heads on a 5.3 in a savannah van and I was wondering what heads were better with a small cam and 75 hp shot of nitrous Reply With Quote. 10-04 ...7477 posts · Joined 2005. #29 · Nov 2, 2013. Stock 243 heads are good for about 20 hp on a 2004 LS1 and can often be found for about $400 or so. 2004 torrid red with red interior A4 GTO (1 of 499) TR-230/236 cam/TEA ported Trick Flow 215 heads/4" CAI/100mm MAF/ported FAST 90/Kooks/Magnaflow.

The outer planets Jupiter, Saturn, Uranus and Neptune all have shorter days than Earth. Among the terrestrial planets, Mars has a slightly longer day than Earth at 24 hours 37 minu...Casting Number 706 and 862 Head: 1999+ 4.8L / 5.3 Liter Truck Material: Aluminimum Part Number: 12559862 12561706 Combustion Chamber Volume: 61.15cc Compression Ratio: 9.5:1 Intake Port Volume: 200cc Exhaust Port Volume: 70cc Intake Valve Diameter: 1.89 inches Exhaust Valve Diameter: 1.55 inches.The valve size is a notable difference between the 906 and 062 Vortec heads. The 906 heads have 1.94-inch intake valves and 1.50-inch exhaust valves, while the 062 heads have slightly larger 1.94-inch intake valves and 1.60-inch exhaust valves. This difference in valve size can affect the engine's overall performance, as we will discuss later ...Mar 2, 2021 · The combustion chamber diameters can play a big role in hindering flow and performance. The 706/862 combustion chamber diameter measures out at around 3.670" and the 243/799 combustion chamber messages out at around 3.880” and giving the fact that the LM7 5.3L engine bore is 3.780" this more than likely has something to do with the power loss ...Casting Number 706 and 862 Head: 1999+ 4.8L / 5.3 Liter Truck Material: Aluminimum Part Number: 12559862 12561706 Combustion Chamber Volume: 61.15cc Compression Ratio: 9.5:1 Intake Port Volume: 200cc Exhaust Port Volume: 70cc Intake Valve Diameter: 1.89 inches Exhaust Valve Diameter: 1.55 inches.2108 posts · Joined 2007. #14 · Jul 18, 2009. Rick@Livernois said: As others have stated, the 243 head would be a step backwards as the L76 uses the same head as a L92/LS3. Our "B" cams are typically used for forced induction. Larger displacement engines will "eat up" the camshaft and actually make it sound much more tame than a stock ...The first has to do with port shape. The LS6 and the later LQ9-LQ4 heads used reshaped intake ports and D-shaped -- as opposed to oval-shaped -- exhaust ports for better flow: 200 cfm intake and 70 cfm exhaust for the 241's, and 210 intake and 75 cfm for the 243's. The second major difference is that the LS6 heads used hollow, sodium-filled ...Get ready to feel the G-forces as we navigate the exhilarating terrain of power and performance. 862 LS Heads aren’t just components; they’re the driving force behind an automotive revolution, and the journey has only just begun! DIY Adventure: Installing 862 LS Heads Like a Pro. Time to get hands-on, gearheads!Once you receive the new ported heads, just send us your OEM heads for the core refund. Available options: (Porting Service) GPI - LS1 Cylinder Head Porting Service. $ 1,095.00. (Purchase Outright) GPI - LS1 Cylinder Head Porting Service + OEM LS1 Cylinder Head Set Core. $ 1,795.00. Your selection:

The head casting numbers are typically 706 or 862. To verify that Castech heads are installed and cracked: Remove the valve cover and valve rockers. Locate the Castech mark under the valve rockers. Small amounts of orange DexCool may be visible in the oil drain wells or around bolt heads (as shown in Figure 3).

In the world of automotive engines, the choice of cylinder heads can significantly impact your vehicle's performance. Two popular options that have gained a lot of attention are the 862 and 317 heads. Each has its strengths and weaknesses, and understanding the differences between them is crucial for making an informed decision. …40 posts · Joined 2018. #46 · Jan 20, 2020. Your 6.0 block is a 4.00 inch bore, you have to run a LS3 type head 5.3 and 4.8 have smaller bores. There are tons of heads out there yours probably came with the 799 castings like my 6.0 did.862 Vs 243 Heads . One of the first things that you need to consider when building a performance engine is what heads to use. There are many different options on the market, but two of the most popular choices are 862 castings and 243 castings. So, which one is better? The 862 heads were originally designed for high performance applications.Here’s my thinking. The 243 has. 2.00 intake and 1.55 exhaust with a 65cc combustion chamber. The 706 has. 1.89 intake and 1.55 exhaust with a 61cc combustion chamber. If I have a set of 2.00 intake valves put in the 706 with the smaller combustion chamber wouldn’t I have a better head with more compression and that’s not counting if I ...Good morning everyone! This is my 1st post here and spent the evening reading here trying to find my problem. Have read a lot about the cracking issues with 706 and 862 heads and figured that to be my problem but then I found I have 243 heads. Can't find anything showing they have the same...Which Stock LS Head Is Best For Building A Boosted Turbo LS Combo? 317, 799, 706, 241, 243, or 862? Feb 23, 2021 Chad Reynolds 1320 Engine Tech, ... Cause I don't. I know I have a couple sets of LS heads sitting in the garage, but could NOT tell you for certain which ones they are. I think one set might be 862 but I can't be sure. I'd ...15 Apr 2018 ... LET'S TALK TECH-243 VS 862. Richard Holdener · 117K views ; Hand porting 706 5.3 heads. Drivin with Drew · 19K views ; How to port your LS cylinde...The 799 heads will need to be milled a bit to get the compression ratio back to where it needs to be. That will determin what pushrod to go with. The stock heads should be something like 61.15 cc. The 799 heads should be 64.45. . 1994 SFBD extcab longbed 20/22 406sbc . Project thread.The LS engines with 799 heads are 5.3L and 4.8L. The sophisticated architecture, cathedral-shaped port, and smaller combustion chamber work amazingly on these truck engines. The smaller combustion chamber with a higher compression ratio offers increased power output. The 799 LS heads boost horsepower up to 25 hp.

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Run with the 317 heads, the modified 5.3L produced 448 hp at 6,800 rpm and 398 lb-ft of torque at 5,000 rpm. After installation of the 706 heads, the power jumped to 468 hp at 6,800 rpm and 413 lb ...The LS3 was run with a Holley HP management system and FAST injectors. With stock heads, the modified LS3 combination produced 552 hp at 6,400 rpm and 513 ft-lbs of torque at 5,000 rpm. After installation of the TFS Gen X 255 heads, the power numbers jumped to 571 hp at 6,500 rpm and 525 ft-lbs of torque at 5,200 rpm.In a comparison of the cammed 243 head and the cammed rectangle-port LS3 head, the LS3 torque peaks at 456 lb-ft (4,800 rpm) while the 243 head madeat leastthat much torque from 3,500 rpm all the ...You could bore to the LS1 pistons run them and get a set of ported 243's. Add a Fast 90mm intake, cam, and you have an 400hp iron block LS6. Thats easily a 100K mile motor. For a stock 5.3L port the heads, cam, and a LS6/Fast intake and it might make 400hp on a engine dyno. But would make 300-325hp at the wheels.Just picked up a set of 862 5.3l heads for $100 and was wondering how well they will work for me. I have a forged 346 and the pistons have a small dish. I haven't done the math but the CR is around 9.2-9.4:1. I want to bring the CR back up to around 10:1. My plans are to hog the heads out and throw in some big valves and have them milled to get ...lt1z. 30920 posts · Joined 2007. #6 · Mar 12, 2015 (Edited) A 317 head on an LS2 will be 10.0:1. A 243 on a LQ9 will be 10.9:1. Only major difference is combustion chamber cc. I would not go with less then 10.0:1 compression on a 2300. Mill a set of 317s to 70cc, run an LS9 gasket and head studs. C6 M6 Vortech 857/725.The cam used was a 231/231 (LSL lobes) on a 114+2. No ported 243 head at 1500 will get you much over 470rwhp and even that will be with a huge cam that most wouldnt want to live with. A Trick Flow 225 with a mid 230's cam has the H/C 1/4 mile record in an LS2 and it isnt a crazy overlap cam.Our fully CNC'd 243 heads give your choice in stock 2.0intake/1.550 or upgraded 2.02Intake/1.600 exhaust with an intake flow of 320cfm and an exhaust flow of 221cfm. 832-619-1622; 7413 Wright Rd. Houston, TX 77041; [email protected]; Skip to content. Home. CNC Porting. Service Prices. Cart. Checkout. Tech.Could that itchy, tickly feeling on your head be head lice? Learn about these tiny insects, such as how to tell if you have them, and how to treat it. Head lice are tiny insects th...Product Details. Lingenfelter offers a CNC ported version of the 243 casting aluminum cylinder head used on the 2001 - 2004 Corvette ZO6, Cadillac CTS-V and the 2005-2007 LS2 powered C6 Corvette, 2005-2006 GTO & SSR. The port and chambers are carefully designed to provide the best combination of high flow capabilities and improved port … ….

No parent wants to think about losing track of their kids in a crowd, but it's best to be prepared just in case. No parent wants to think about losing track of their kids in a crow...Description. LS1 LS2 CATHEDRAL PORT - 243 CYLINDER HEADS. Sold as a Pair - Bare. Machined - ready for assembly. Suit the 5.7ltr and 6.0ltr. These Cylinder heads are a High-Performance replacement to the GM 243 heads. All factory mounting points with the Performance of the 243 port and chamber. You can use your existing valves & springs.Mar 9, 2016 · By Paul Johnson - March 9, 2016. This article applies to Chevrolet Camaro and Pontiac Firebird (1998-2002), as well as all LSx engines. The cylinder head (or "head") has several main functions. Its first order of business is sealing the top of the cylinder (the piston seals the other end). The second order of business is to provide a way for ...I’ve had some emails and messages, on the SierraC3TV Facebook page, making arguments against using 706 heads on my 6.0. In this episode, I give my reasons wh...The head casting numbers are typically 706 or 862. To verify that Castech heads are installed and cracked: Remove the valve cover and valve rockers. Locate the Castech mark under the valve rockers. Small amounts of orange DexCool may be visible in the oil drain wells or around bolt heads (as shown in Figure 3).CorvetteForum - Chevrolet Corvette Forum Discussion. C5 Corvettes, 1997 - 2004. C5 Tech. 6.2 with 243 head. C5 Tech Corvette Tech/Performance: LS1 Corvette Technical Info, Internal Engine, External Engine, Tech Topics, Basic Tech, Maintenance, How to Remove & Replace. Sponsored by:The reason is simple: The more you squeeze the air and fuel mixture in the combustion chamber, the more power you can create. In theory, forcing air and fuel in as small a combustion chamber as possible (measured in volume) will yield maximum engine compression and horsepower. There are a number of ways to accomplish the task.May 7, 2023 · Street Performance of The 706 Head. It’s worth noting that the 706 heads have a larger combustion chamber than the 862 heads, which measures at around 71cc. While this might sound like a disadvantage, it can actually be helpful for engines running on lower-octane fuel or those using forced induction.GM never made an iron LS1. Look at the front of the block and it will clearly have the displacement cast into it. If it is a 5.3, slap some 243's on it and a punchy mid range cam in it and it'll be a good street brawler. If it is a 4.8, some aftermarket heads with revised valve angles and dual valvesprings (TF Gen X 205 for example) and a cam ... 862 vs 243 heads, CNC Ported LS 5.3L 706 / 862 Cylinder Heads, Customer Supplied Bare Casting. $599.95. Buy in monthly payments with Affirm on orders over $50. Learn more. Options. Resurface for MLS Gaskets + $150.00. Valve Job with new Valve Guides + $400.00. Cylinder head Assembly + $150.00. Add to Cart., Here’s a quick data sheet on the specs of 799 heads. Due to the similarity, 243 heads should follow the same characteristics in normal situations: Combustion chamber volume: 64.45cc. Intake port volume: 210cc (sometimes seen as 209cc too) Exhaust port volume: 75cc. Intake valve diameter: 2.00 inches., I used a Comp 219/227 .607/.617 (ish) cam on a 2008 5.3L w/ longtubes and stock 243 head. Iit picked up 46hp over the stock cam. The world's best cam combined with a poor set of heads will produce an engine that's a dog. But bolt on a set of great heads even with a poor cam, and that engine will still make great power., When it comes to the GM's LM7 engines, the 862 cylinder heads are an integral part. Constructed from lightweight aluminum material, these cylinder heads feature a 61cc combustion chamber volume for improved efficiency and performance. The intake port is shaped in a classic cathedral design while the exhaust port has an oval shape for better ..., Find Parts and Accessories 243 ls heads KEYWORD and get Free Shipping on Orders Over $109 at Summit Racing! Use your Summit Racing SpeedCard today, and get up to 10% back - Get Details! ... 243/257 dur @.050", .689"/.672" lift, 108.5 deg LSA. Part Number: CXM-03-08-0098. Not Yet Reviewed. Estimated Ship Date: May 23, 2024 if ordered today. Free ..., Speed Works has teamed up with Wilkes Performance to bring you the most powerful heads available. 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 .660 dual race springs with WP titanium retainers., European heads of state are meeting today in Brussels for their latest bout of dialogue on the EU crisis. European Council president Herman van Rompuy writes, “The main purpose of ..., 243 is the Z06 casting, 241 is the last and best LS1 casting. The 243 has D-shaped exhaust ports and some other minor differences. Reply Like. 05-16-2007, 01:48 PM. # 3. 94legaleagle. Melting Slicks. Thread Starter. Member Since: Mar 2005., Which Stock LS Head Is Best For Building A Boosted Turbo LS Combo? 317, 799, 706, 241, 243, or 862? Feb 23, 2021 Chad Reynolds 1320 Engine Tech, ... Cause I don't. I know I have a couple sets of LS heads sitting in the garage, but could NOT tell you for certain which ones they are. I think one set might be 862 but I can't be sure. I'd ..., Heads/Cam/Intake Manifold/Internals ..., You will see 50+rwhp probably at same psi. 317/243 heads flow MUCH better than 862 truck heads. flow more at .400 lift than the 862's flow at .550 lift. Boost will also lover the bigger 2" intake valves. 243's with their smaller combustion chambers would be a better match. than the 317's., The 243's have bigger valves which do better on 4.0" and larger bores. On the smaller 3.898/3.78" bores of the LS1/6 & all 5.3/4.8's the 706 are very decent. On a 4.00" bore of an LQ4 though it is splitting hairs. On the same cam, on the same engine, the heads are going to perform within +/- 5hp/5tq of each other, it is almost meaningless., Porting the 243 heads is an effective way to improve airflow into and out of the engine, as it involves modifying intake and exhaust ports for greater efficiency. With this modification, air flows more easily into the combustion chamber which results in increased power output. ... Sometimes the difference between the 706 and 862 heads is ..., The LQ4 is a 6.0L LS (Gen. 3) small block engine used in GM trucks between 1999 and 2007. For marketing purposes, it was also known as the Vortec 6000. The engine specs and information listed here is for the stock LQ4 engine. Mechanically similar, General Motors’ LS and LS-based Vortec engines wound up on almost every branch of the GM …, Part 6 of the LS 5.3L Build will cover Installation of the 862 Aluminum Heads, Lifters, Pushrods, and Rocker Arms. Project Rowdy is a restoration on a 1979 J..., 862 Vs 243 Heads . One of the first things that you need to consider when building a performance engine is what heads to use. There are many different options on the market, but two of the most popular choices are 862 castings and 243 castings. So, which one is better? The 862 heads were originally designed for high performance applications., Swapping in 243 heads will increase flow a little, but unless you mill them first, you'll lose compression. If anything, you want to raise compression. For just a basic bolt-on 5.3, the 862 heads will do a decent job. ... The 706 and 862 castings aren't different, much like the 799 and 243 castings are identical. If you have 862s, I would ..., No parent wants to think about losing track of their kids in a crowd, but it's best to be prepared just in case. No parent wants to think about losing track of their kids in a crow..., The 243 heads flow 10 cfm more on the intake side, and like 7 cfm more on the exhaust side (if memory serves me correctly). The combustion chamber is a difference of 3cc smaller on the 243's. Valve sizes are identical in both sets of heads. I know that when replacing heads you should have them worked (e.g.- valve job, and such)., Both of the cylinder heads possess the same valve size. Additionally, they have ports and chamber cores of the same size. The actual difference lies within the compression ratio of the two. 862 heads are cast on sand molds, but 706 cylinder heads are cast on a semi-permanent mold. 862 heads also fit into smaller combustion chambers as compared ..., The first has to do with port shape. The LS6 and the later LQ9-LQ4 heads used reshaped intake ports and D-shaped -- as opposed to oval-shaped -- exhaust ports for better flow: 200 cfm intake and 70 cfm exhaust for the 241's, and 210 intake and 75 cfm for the 243's. The second major difference is that the LS6 heads used hollow, sodium-filled ..., Of course, today’s 5.3 and 4.8 both have 243 heads that are factory-designed. 243 heads were included in the LS6 engine produced between 2001 and 2006. You can determine the 243 heads on the 5.3 by examining the three-digit stamping next to the valve cover. The Sierra 1500 and Silverado from GM produced between 1999 and 2013 had 243 heads., doing math an saying you have 2cc worth of valve notchs i got you around 12-1 comp wise with the 58.5 in for head cc an pistons out .006..with the 60cc 243s i got you at 11.8-1 with 2cc notchs,.006 out and .040 gaskets..hope this helps. I had them actually cc'd after I removed em.. 61.5.. Steve. 408, th400, 1100rwhp.., 2005 GTO QSM, 418" NaturallyAspirated ,Bullet Racing cam, 243 heads, 6speed, Kooks 1-3/4" headers w/cats ,matchported FAST 102,NW 102mm, 3.73 gears PB in 1/8th 7.76@97 on Firestones with 1.97 60'. Tick Performance tuned., Why are Chevy 706 Heads better than 317 or 862 Heads? 706 Heads Vs. 317 Heads; Most people tend to prefer 317 heads as they have improved ports, same as 243 and 799 Heads, which are more expensive. However, 317 heads have larger combustion chambers of 71.06cc, which will cost performance, especially on a naturally aspirated engine. This ..., The LS3 head at 265 cc of volume compared to 214. cc for the 243, has much less air velocity at low lifts and low rpms. Now. GM also put the LS3 heads on an engine with 30 more cubic inches; but with an intake runner volume equal to the old big block oval ports, they really seem to shine on 427 cid and larger engines., The LS engines with 799 heads are 5.3L and 4.8L. The sophisticated architecture, cathedral-shaped port, and smaller combustion chamber work amazingly on these truck engines. The smaller combustion chamber with a higher compression ratio offers increased power output. The 799 LS heads boost horsepower up to 25 hp., 799 LS Engine Cylinder Heads are some of the most recent cylinder heads on the automotive parts market. The cylinder cast architecture is with a semi-permanent mold method. The 799 cylinder heads are in the similitude to the 2004 LS2 cylinder heads due to the triangle casting marks similarity. However, unlike the 243 heads, they do not require ..., Advertisement Some say the power of aphrodisiacs is all in our heads. In other words, it's a placebo effect -- if we think something is going to put us in the mood for love, we'll ..., DESCRIPTION Professionally rebuilt 5.3 Chevrolet / GM cylinder heads. These cylinder head's casting numbers are: 243 ONLY! THESE HEADS ARE THE SOUGHT AFTER 243 CASTING NUMBERS ONLY THIS IS FOR A PAIR HEADS! DETAILS Heads are thoroughly cleaned and inspected Pressure tested to ensure no cracks or leaks Guide work performed / replaced with new guides as necessary Valve job / performed on Serdi ..., Is 862 Heads Any Good? If you are asking, “Are 862 heads any good?” The 862 heads are pretty good because they can deliver better compression after a porting job. However, …, Upgrade your Chevy 5.3L V8 engine with our Remanufactured 99-06 Chevy 5.3L V8 706/862 Aluminum Cylinder Head (Part#: ALL-20314). To ensure a high level of performance, these Chevrolet heads are built to exceed OEM specifications. These 706 heads for sale are perfect for your 5.3L V8 engine, offering enhanced power and efficiency., So I have a friend who's got a 5.3 for sale supposedly out of a 2007 truck. I'm not sure were to look on the motor to know this for sure it has 862 heads which all the info I could find was that they came on the 99-00 5.3. It has a fan which I thought 05 ups had electric fans. I pointed this out to him which he pointed out it also has electric tb.