862 vs 243 heads

Posted March 1, 2011. On 2/28/2011 at 11:24 AM, Krambo said: Well, 243's are a good way to increase compression. With a stock 64cc combustion chamber on the 243's and your LQ4, your looking at about 10.5:1 SCR vs roughly 9.4:1SCR with the stock 71cc 317's...gasket dependent. The bump in compression will be nice along with the better designed ...

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...LS1 with 862 heads. I may have found an LS1 shortblock I can drop in my truck but I want to know if I can use the 862 heads from my 4.8 on the LS1. Also, what will the CR be if I use the 862's on the LS1. Thanks in advance. It will bump your CR up a hair, 4.8/5.3 heads and LS1 heads flow the same, the only difference is the combustion chamber.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 ...7477 posts · Joined 2005. #5 · Jul 14, 2010. The .040" Cometic gaskets will raise compression ratio, not lower it. That said, the GM MLS gaskets seal up the best and are a decent price. I got mine from Texas Speed. Get the LS1 gaskets that are 3.910" bore diameters. That's what I used and I have no problems.Jun 13, 2022 · Which heads are better 706 vs 862? Sometimes the difference between the 706 and 862 heads is negligible, but there are a few notable distinctions. The 862 heads are sand cast, while the 706 heads use a semi-permanent molding process. Additionally, the combustion chambers of the 862 heads are smaller than those of their predecessors - this ...5.3 vs Vortec 350 in a Jeep; Changed direction on project. A1000 fuel regulator questions; Fuel boiling.... Breaking up at 5k and above RPM; ... 862 vs. 243 Heads; Holley Tunnel Ram; Easiest way to rig starter? perf rpm; 5.3 teardown/build; started my swap; Help with Rad Fans; FYI for Performer RPM users!!I have GM MLS head gaskets with a 0.051" compressed height and am planning for 0.010" out of block for a 0.041" quench. This should net me a compression ratio of 11.16:1. ... LS3 aluminum block (4.070" bore), 3.622" stroke, 243 64cc heads, flat tops with -3.2cc valve reliefs, 0.051" GM MLS head gaskets. combo will use a 228r cam, ported 243's ...

BTR HEAD GASKET - 4.8/5.3/LS1 - SOLD IN PAIRS - BTR98544. WILL NOT WORK WITH EARLY STYLE NOTCHED LS1 CYLINDER HEADS! BTR has sourced our very own MLS head gasket that can be used on 4.8, 5.3, and LS1 engines. This is a DIRECT REPLACEMENT for the LS1/LS6 GM head gaskets. This gasket has everything you know and love from the GM version: High ...Dec 1, 2010 · The 241 castings feature 205cc intake ports, 70cc exhaust ports, and a 2.0/1.55 valve combination. The hot factory heads would be the LS6 (243 castings), but even the stock LS1 heads can be made ...Apr 14, 2012 · 3012 posts · Joined 2008. #1 · Apr 14, 2012. I have a 2004 Aluminum 5.3 with 70k miles that has 862 heads on it. I also have a set of 243 heads off of a 2009 Aluminum 5.3. Which heads should I use? I've been told the 243's flow better and the 862's supposedly raise compression .5 a point.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 ...LSX3rdGen. The 241 head is a stock ls1 head it was on the f bodys and also on the ls1 vettes. They were produced between 2000 and 2003. they are the same as the 853, the 853 was made from 1997 to 2000. ls6 heads are 243's.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 velocity.

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.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 …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.Get the best deals for ls 243 heads at eBay.com. We have a great online selection at the lowest prices with Fast & Free shipping on many items! Skip to main content. Shop by category ... GM LS 706 806 862 241 799 862 243 CYLINDER HEAD REBUILD SERVICE 3 BUISNESS DAY. Opens in a new window or tab. Remanufactured. $459.99. Save up to 10% when you ...Aug 6, 2020 · 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.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 heads

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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. CMIIW: I've been told there is no major difference between the 706 and 862 heads once you work them over. So I'd be okay having the 862's ported/polished/rebuilt rather than my current 706's.So, casting 862 heads would do favors for your car with a perfect set up. Last Words. In a nutshell, the LS 862 heads are the best-performing, affordable, and ported 5.3 heads that will best suit your car. If you are looking for a high-performing cylinder head at an economical price, then the 862 LS heads are definitely a great choice.LSX3rdGen. The 241 head is a stock ls1 head it was on the f bodys and also on the ls1 vettes. They were produced between 2000 and 2003. they are the same as the 853, the 853 was made from 1997 to 2000. ls6 heads are 243's.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 …The 5.3 heads will have a casting number of 862 or 706. The 5.7 heads can have 806 (97-98 perimeter bolt), 241 or 853 (99-up LS1 heads), and 243 (LS6/LS2 heads). The factory chamber on a 5.3 head is approx. 61cc. Some guys will use 5.3 heads to up their compression. The heads flow like a LS1, but have the smaller chamber.862 heads vs 243. The 862 casting number represents the 862 cylinder head. The 862 heads came on all LQ9 6.0 engine blocks and are completely interchangeable with the 243 cylinder head. Both the 243 and 862 heads have the same 64cc combustion chamber, but there are some very slight differences in the pore size of the two heads.

by Raodlife. 862 head is an option for the 4.6L and 5.4L Modular V-8 engines. This head is a great upgrade and a bolt-on option to increase power. The 862 …Chevy Cylinder Head LS1/LS6 243/799 - PAIR, Year:97-04. NEW CNC Ported LS1/LS6 Cylinder Heads .650 Springs 2.02/1.59 Valves PAIR. CNC Ported LS1/LS6 243/799 Cylinder Heads .650 Springs 2.02/1.59 Valves PAIR. Check out Our Other Articles: Everything You Need to Know about LS3 Heads. 823 Heads – Everything You Should Know About. All About 243 ...See my Signature for full the mods. I have comp cam 222/224 566/568 112lsa. Yes 05 has 6.0L motor vs 5.7L. If you are just make a swap from stock 241's to stock 243's then 15-20rwhp would be a "safe" expectation..... maybe use a cometic gasket set to get the CR up a bit and the quench better for some extra power.According to the trusty flow bench, the chamber work did indeed improve the flow rate of our 706 heads, with the largest gains coming at 0.200 lift for the intake and 0.400 lift for the exhaust ...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 243/799 Cathedral casting 5 axis CNC Porting with stainless valves and WP .660 dual race springs with WP titanium retainers.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.GM 243 (LS6) and 799 (LS2), 218 cc. The 218-cc LS6/LS2 head is a mild upgrade from the basic performance rebuild, which boosts flow by 32.2 cfm on the intake side and 28.5 …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 ...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 headsGot lucky at a local junkyard and snagged a set of 862 heads off a wrecked z71 2000-2006 body style. thinking about building these (port n ... (Pressed) The SPM cast is 100X better than sand cast heads. That is why the 243's are SPM cast over the truck version 317's, and the L92's 823 Sand cast VS the LS3's 821 SPM cast.. starting to ...RPO L99 and LS3 cylinder heads are aluminum with 68cc combustion chambers, rectangle intake ports with 257cc runners, D-port exhaust with 87cc runners, 2.165˝ intake valves and 1.590˝ exhaust valves. These heads can be CNC-ported to improve on flow and milled for higher compression. These heads are almost the same, but the L99 heads used a ...

Get the best deals for ls 243 heads at eBay.com. We have a great online selection at the lowest prices with Fast & Free shipping on many items! Skip to main content. Shop by category ... GM LS 706 806 862 241 799 862 243 CYLINDER HEAD REBUILD SERVICE 3 BUISNESS DAY. Opens in a new window or tab. Remanufactured. $459.99. Save up to 10% when you ...

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 ...118. Intake valve is 2" on the 241, exhaust valve is same size as the 862. If planning on 241 heads on a 5.3 you will lose compression and hp. The Fleet... 2003 Suburban- 5.4 L59 331CI 10:5.1 Compression -Built by ME. 2004 Avalanche- 5.7 LS1 -NOT built by me. 2005 Silverado RCSB- 5.7 LS6 -Built by ME. Reply With Quote.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 ...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.If you are hearing that both 799 and 243 heads are the same, here is where you will spot the main difference. The 799 cylinder heads have a sand casting and finish, which makes them rough. On the other hand, the 243 heads have a metal casting and finish, which makes them smoother than sand casting ones. I didn't notice that myself at first.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.Our fellow tech writer and dyno-flogger Richard Holdener reports a gain of roughly 15 hp with stock 5.3-liter heads on a 6.0-liter. Our 5.7-liter head test bumped the average power by 9 hp but ...Apr 15, 2023 · The 799 head is designed and made to be compatible with high-performing LS engines, such as 4.8L, 5.3L, 5.7L, or 6.0L, etc. These vehicles require maximum airflow, making the 799 head an ideal choice. On the other hand, the 862 head is compatible with LR4, LM4, and LM7 and such engines where low torque is more essential than better horsepower.243 Head flow chart. I can't decide on having my 243 heads polished and CNC ported or getting a set of trick flow heads. I understand places such as AFR can do this and custom grind a cam to match. If I could see a flow chart for the original LS2 heads (243) it would be of great help. Some say you can't get serious gains from the 243's, some ...The LC9 came in GM trucks and SUVs in 2007-‘11 and made 315 horsepower right out of the box. It’s a Gen. 4 5.3L aluminum-block engine, so you’re getting the better intake manifold, connecting rods, and ECM. The engine also had 799 or 243 casting heads which are closely related to the LS6.

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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..The main difference between 799 and 243 heads is the amount of valve lift that they can provide. 799 heads have a higher valve lift capability than 243 heads, meaning they can provide more airflow into the engine. This often results in increased power output from the engine. 243 heads also tend to be lighter than 799 heads, which can be ...The LS6 also received better (243 castings) heads, a slightly more aggressive cam, and a much improved intake manifold. The LS6 cam is the most aggressive cam GM put out for cathedral port headed ...Aug 2, 2010 · Compression Ratio & Combustion Chamber Size. I'm looking to install a set of 243/799 heads on my 5.3. The stock heads have a combustion chamber volume of 61.15cc, and 243/799 heads have a volume of 64.45cc. My stock compression ratio is 9.5:1. I already know that I need to mill the heads .007" to lose 1cc of volume.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 ...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!No 243s or 799 have the casting defect that I've heard, it was pretty isolated to the castech only 706's on gen III 4.8/5.3's. There are 2 other sets of 706's that are not affected. The early sand cast heads come as 862s and 706's, and a die cast 706 that isn't made by castech. 16 posts.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.let's talk tech, anyone ever see a set of stock 243 heads flow 270+ cfm? we compared 243 heads to 862 heads, ported, chamber work & big valve.Head and face reconstruction is surgery to repair or reshape deformities of the head and face (craniofacial). Head and face reconstruction is surgery to repair or reshape deformiti... ….

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.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 …862 heads vs 243. The 862 casting number represents the 862 cylinder head. The 862 heads came on all LQ9 6.0 engine blocks and are completely interchangeable with the 243 cylinder head. Both the 243 and 862 heads have the same 64cc combustion chamber, but there are some very slight differences in the pore size of …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.Travolta's 707 is now headed back to Australia, where it will be maintained and put on display with the Historical Aircraft Restoration Society. John Travolta by any measure is an ...In any event, although the dyno did not show a huge gain, the SOP feel with the heads is serious. The Goat pulls much, much harder, especially above 2600 rpms or so. Ron at Vengeance told me that the as cast typically dyno about 10-12 HP less than the CNCs. 2018 Camaro ZL1 1LE: 649 HP 689 Trq.You don't need it at 500hp. A 1-7/8" tube typically runs out of room at around 1khp. Your fine. As mentioned, the gains seen from porting won't be huge. The reason is everything is already working pretty darn good as is. It would take a few more radical steps to move north on power.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 ... 862 vs 243 heads, Well, I switched from the 223 to the 243. Two reasons: first, the shafts in my 223s were not the correct shafts ( too light 105g); and, second, the gapping on the the 223 made no sense with 5* difference on the scoring clubs (8 thru GW). Findings after 4 rounds. The spec for the shafts is .25 inches longer. The head is definitely smaller., 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 ..., 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)., Are you looking for a new shaver head for your Norelco electric razor? If so, you’ve come to the right place. In this article, we’ll provide you with all the information you need t..., 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., 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., 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 heads, ddawson. 15570 posts · Joined 2004. #4 · Sep 29, 2008. The 317 is a 243 but with a larger CC. I have the 317 on my car with 70CC. 1969 Corvette, 427 Convertible. 496CI Edelbrock Heads, Quickfuel Carb, LS6 Intake. Straub Technologies 229/235 .590/.559 107, Hedman Headers, Magnaflow Exhaust. Speed Direct Rack and Pinion, Semi Coilovers ..., 706 heads tend to be more popular than 243 heads with those who run naturally aspirated engines. While they don't have the same size combustion chamber they also don't have the tendency to lower the compression ratio and reduce horsepower. When looking to replace your heads, they offer a high degree of consistency since they are ..., If you know how to look for heads you can buy them cheap if you know what trucks they came on. Go here and look, I have seen them as cheap as $100 a head. www.car-part.com. 2013 inferno orange ZL1 Camaro, basic mods. Pulley, injectors, mild bolt on's- 590rwhp. 11.70@122 with a six speed and a hard tire., Pros And Cons Of Doing A 243/799 Cylinder Head Swap On The LM7, DESCRIPTION: GM GMC Chevy V8 This listing is for the Brand GM GMC 706 castings Reinforced casting makes this. Home; Home › 799 heads on compression › ... 862 Heads Max Milling Forums. DESCRIPTION: GM GMC Chevy V8 This listing is for the Brand GM GMC 706 castings Reinforced ..., Aug 7, 2023 · For the 862 heads, the intake valve size is 1.89 inches and the exhaust valve measures 1.55 inches. The 706 heads, however, feature an intake valve size of 2.00 inches and an exhaust valve size of 1.55 inches. In terms of port volumes, the 706 heads have larger intake ports., 862 Heads This site contains Ebay partner affiliate links, which may earn us a commission at no additional cost to you. Gm Chevrolet Gmc 4.8l 5.3l Cylinder Head 862 Assy W Rocker Arms, The 799 head is designed and made to be compatible with high-performing LS engines, such as 4.8L, 5.3L, 5.7L, or 6.0L, etc. These vehicles require maximum airflow, making the 799 head an ideal choice. On the other hand, the 862 head is compatible with LR4, LM4, and LM7 and such engines where low torque is more essential than better horsepower., Nov 18, 2022 · 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 ..., Feb 18, 2024 · 706 heads tend to be more popular than 243 heads with those who run naturally aspirated engines. While they don’t have the same size combustion chamber they also don’t have the tendency to lower the compression ratio and reduce horsepower. When looking to replace your heads, they offer a high degree of consistency since they are ..., Fits. The price listed is for you sending your cathedral port cylinder heads (4.8/5.3, LS1, LS6, LS2, LQ4/9) to us for porting. Our stage 1 porting service will include the re-use of the stock vales. Stage 2.5 will include aftermarket 2.02/1.57 stainless steel valves. We also offer valve spring upgrades. PRC CNC Porting/Machining Service Includes:, WNY. Dec 23, 2016. #2. I'm no expert on this but, 07 on 5.3's had the 243 heads and from what I read they are the most desirable.The 243 and 799 heads are pretty much the same, dismantlers claim that they often find one of each on the same factory truck engine. You might want to do some research into the 243., 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!, 1291 posts · Joined 2007. #12 · Feb 3, 2010 (Edited) i purchased at set of 799 heads last summer for $100.00 bucks ,from another member on this forum. keep us posted when this project is complete. im going the budget daily driver route myself. i will be topping mine of with a fast,and a ported throttle body., So at the rate you mill 243's to 862's, you still will gain higher compression yields from 862's with less impact to manifold alignment or mis-alignment. Really the best upgrades are the LS3 heads, especially if you are buying intake, fuel rails etc. . If you do not have a 4 inch bore, LS3 is not recommended. Hope this helps on the heads., 243 Heads. Thread starter Tonyrodz; Start date Apr 25, 2017; ... Not looking to swap out for a stock casting head. He also has a motor, 4.8 actually, that has the 862 heads on them. Same as mine. He's gonna scrap that motor, which sux. Apr 25, 2017 #7 iamdub Full Access Member. Joined Apr 23, 2016 Posts 20,787 Reaction score, Regarding finish, many reviews say 799s deliver a smoother one than its rival when pitching them against each other. 823 vs 243 Heads. As mentioned about the LS 823 heads specs, its bigger intake port owns a 70cc, whereas the common 243 L6 cylinder heads have basically a smaller volume at 64cc., 823 vs 243 Heads. As mentioned about the LS 823 heads specs, its bigger intake port owns a 70cc, whereas the common 243 L6 cylinder heads have basically a smaller volume at 64cc. This means that 823s offer and promote better overall performance in the vehicle's combustion chamber., The heads on it right now are 862's. ... If you can get the 317 heads for a good deal you should be able to make more power at the same psi if they are ported good . ... ^^^ This ir run down some ported 243/799s would be good. You can usually run across some ported 243s for a decent price., IMO, a 243 CNC head and LS6 intake (or spend the chese for a FAST 92) will definately make a great street motor. i made peak power at 6000 rpms and shift at 6600 rpms. its a mule and could last forever if i didnt decide to spray it all the time . 1999 Pontiac Trans Am. Save Share., The LS6 also received better (243 castings) heads, a slightly more aggressive cam, and a much improved intake manifold. The LS6 cam is the most aggressive cam GM put out for cathedral port headed ..., The Enforcer heads have a 210cc intake port volume along with an 82cc exhaust port volume. The heads use a standard LS 15-degree valve angle with a 1.500-inch outside diameter valve spring pocket. The combustion chamber measures 64cc's in size and the heads need an engine with a minimum 3.900-inch bore diameter. Why AFR Introduced The Enforcer., It is way too small for an LQ4 IMO. I would do a set of ported 243 heads from either AI, TEA or TSP in that order. For a cam I would look at something like the TSP TQv2 or MS3. My cousin had an LQ4 with patriot ported 243 heads and an MS3 and it drove great behind a T56 with stock 3.42 gears., 933: Found on 1997 LS1 engines up to mid-September. Although 862 and 706 heads share many similarities, the primary difference is that the 706 heads are made using SPM (semi-permanent mold) while the 862 heads are not. This makes the 706 heads slightly superior. Cylinder Head., It is an aluminum block 5.3 with either 706 or 862 heads, NON DOD. The 05-09 GMT360's got the LH6 and the 07+ will more than likely have 243/799's. In 07+ all the 5.3's started getting the 243/799 heads. The early years will obviously depend on what 5.3 equipped vehicle you have., 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 ..., The 243 heads have larger intake and exhaust ports than the stock heads, allowing for an improved airflow that increases torque and horsepower. With this increased airflow comes a greater capacity to burn fuel efficiently, giving you better performance overall. Additionally, these upgraded 243 heads are designed with a higher-lift camshaft …