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Thanks and for those that are intersted this is what was found thanks to Lothar pointing out my crappy search terms. Casting Number 241. Head: 1997+ LS1 5.7 Litre Passenger Car. Material: Aluminimum. Part Number: 12559853 (1997-98) 12559853 (1999-00) (not sure why same PN) 12564241 (2001-03) Combustion Chamber Volume: 66.67cc.Buy GM LS2 LS6 Gen III Gen IV SET OF 2 Remanufactured Cylinder Heads 243 Assembly w/Rocker Arms OEM REMANUFACTURED (Renewed): ... GM 4.8L 5.3L LS REMANUFACTURED Cylinder Head 862 Assembly w/Rocker Arms 706. Add to Cart . Add to Cart . Add to Cart . Add to Cart . Customer Rating: 4.2 out of 5 stars: 3.2 out of 5 stars: 2.8 out of 5 stars:Ai GM 243 LS2/LS6 Performance Rebuild Cylinder Head Package. Our Performance Rebuild suite of inspection and machine work is a great option for the value minded. Even in as cast form the GM LS cathedral castings are capable of producing impressive power levels. If you are building a budget setup, we can bring the factory head back into better ...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.biscuit_08 said: I was jw cuz i seen it done on the ls1 and them makin more power with cnc ported heads i was just seein if it would do the same on a 6.0. The key word.. ported. In stock form its a downgrade. People use the 5.3 casting because of the smaller combustion chamber without milling the heads and changing the pushrod length.1518 posts · Joined 2009. #7 · May 3, 2010. I just got my quote from AI for their full 226cc CNC work and the price can not be beat. With shipping back from them the price is just a bit over $1,000. They also have a budget pricing port job as well but yields about 10rwhp lower.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 ...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.St. Jude Donor '03. 853 and 241 are basically identical. 853 was used on 99-00 LS1 engines. 241 was used on 01-04 LS1 engines. They both have a 66.67 cc combustion chamber (10.1 CR), 200cc intake runners, and 70cc (round) exhaust ports. The 243 head is the 01+ LS6/LS2 head.Quote: Originally Posted by lil john. True Tuskyz, also the 821's have less meat, *Some porters don't like to go over 270'cc while the the 823's are good to around 280'cc. Phil @ Advanced Inductions gave me a quote on the 280cc version on my #821 heads. Reply Like. 08-12-2016, 09:11 AM.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.But as for the 5.3/4.8 heads, they used the same cylinder heads, identical. The only difference from the 706 and the 862 heads, are the way they are made. The 862 heads are sand cast, and the 706s are SPM (Semi permanent molded), but with just a bit of machine work, the difference between the two is null.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.GM 706/862 5.3-Liter LS1, 218 cc. GM 243 (LS6) and 799 (LS2), 218 cc. GM 243 (LS6) and 799 (LS2), 226 cc. While not the largest name in the industry, AI is well respected. This North Carolina-based shop is practically a factory for CNC head porting, with programs for the Gen II, III, and IV small-block only.243/799 heads are identical, except 243 heads from a 02-04 C5Z Vette with the LS6 Engine. Those 243 heads used Hollow Stem and Sodium Filled Intake/Exhaust Valves, which are much lighter. The 243 heads off of a LS6 Engine in the CTS-V uses standard valves. Like mentioned tho, 243 heads have a smoother finish, while 799 heads are a bit rougher.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.243 heads on 5.3l. Thread starter riccotxtre; Start date Jun 26, 2020; Disclaimer: Links on this page pointing to Amazon, eBay and other sites may include affiliate code. If you click them and make a purchase, we may earn a small commission. Jun 26, 2020 #1 R. riccotxtre TYF Newbie. Joined Jun 19, 2015 Posts 14

The 243 vs. The 799 Cylinder Head. As you have most likely caught on by now, these two cylinder heads are practically the same. The main difference between the 243 and 799 cylinder heads is that the 243 was used on older engines from GM Research, while the 799 has been used on newer engines from multiple manufacturers.Upgrade your LS1 or LS6 engine with our Remanufactured CNC Ported 243/799 Cylinder Heads with .650 Springs and 2.02/1.59 Valves. These high-performance heads, designed by Chevrolet, are meticulously remanufactured to exceed OEM specifications, ensuring top-notch quality. These CNC Ported LS heads, part number ALL-65056PC, fit engines …Equipped with the 317 heads, the turbo 6.2L produced 807 hp at 6,800 rpm and 747 lb-ft of torque at 4,900 rpm. The boost pressure peaked at 7.6 psi, before dropping to 6.9 psi at 7,000 rpm. The ...I've got the opportunity to pick up a set of 862 heads for a good price. I know that these heads flow pretty well but with higher compression. My question is can they be made to flow as good as 243 heads or close to it? And would it be worth it for me to do that? I'm only planning on lightly modding my truck, cam, head work, LT headers, 3000 stall, gears, intake and injectors.

If so, the 862 has a tiny 1.9 intake valve. The 317 head has 2.0 valve and a larger intake runner cc, like the LS6. The 862 in a good bench make 220ish cfm, 317s as much as 257 or so. Just has a larger combustion chamber.This is an adventure-biking sub dedicated to the vast world that exists between ultralight road racing and technical singletrack. All-road, crossover, gravel, monster-cross, road-plus, supple tires, steel frames, vintage bikes, hybrids, commuting, bike touring, bikepacking, fatbiking, single-speeds, fixies, Frankenbikes with ragbag parts and specs, etc. are all fair game here.…

Reader Q&A - also see RECOMMENDED ARTICLES & FAQs. I’ve had some emails and messages, on the SierraC3. Possible cause: For the sake of mass production, the production Gen III V-8 cylinder h.