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It happens to even the best DIYer: the simple process of removing a screw becomes a struggle when the screw refuses to budge and the head of the screw becomes stripped. But not all...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.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 other option, assuming one or both heads are having actual issues, is to hit a local junkyard and pull another set of 862's for <$100, clean them up, and slap them on. 2004 Silverado 1500 (ish); 2005 Silverado 1500. 1964 C60; 1985 K30 Detroit Diesel.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.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...I flow a stock 706, 862, and 317 LS Head and share the numbers.I flow a stock 706, 862, and 317 LS Head and share the numbers.Jun 11, 2020 · 64nailhead. 4523 posts · Joined 2012. #5 · Jun 13, 2020. Here's your decision - the 317's will work better if you're looking for boosted 1000+ HP, but the 243's will work better everywhere below that. Something to keep in mind, old school SBC and SBF static and dynamic compression ratios do not apply to LS heads.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.My 2007 came with 243 heads stock. the 862's are off the early 4.8-5.3 motors after about 99 I believe. I also believe texas speed used to have the 2.05 valve opton on those heads at one time. I run 2.04 valves on mine. 12-30-2010, 08:54 AM #7.I've seen 400-500 for a heads with valves/seals/springs (most likely need to change them)/retainers/locks. 243 heads from c5 z06s have the sodium filled exhaust valves and hollow intake valves. Last edited by nullpointer; 08-17-2020 at 10:07 AM. They made millions of them. 799 is the same head.I was thinking more along the lines of a ported 243 casting with a fast 90 (i figure at least $3300 for the whole kit and kabootle) figuring 2K (lets use livernois stage 3R's for pricing purposes) for the heads and 1300 for a ported fast. I havnt seen many guys go with a setup quite like this so im not sure what the powerband will look like ...I'd be into the 243's for more than the "Proheader" heads which claim pretty good flow numbers and have larger SS valves. ... Had originally planned to run the 862 heads. Then found a set of 243's for $300 and figured I might as well grab them… now I found these. Save Share.They seemed like a good idea at a time, but these sbc TW heads had a lot of problems. Firstly, they were never designed to be a serious performance cylinder head. Where they did fare acceptably was on a mild street sbc with a low lift, short duration camshaft. I did own a set in the past, and have seen several sets come through the shop.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 ...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...The other option, assuming one or both heads are having actual issues, is to hit a local junkyard and pull another set of 862's for <$100, clean them up, and slap them on. 2004 Silverado 1500 (ish); 2005 Silverado 1500. 1964 C60; 1985 K30 Detroit Diesel.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.Last Updated on Aug 16, 2023 By Paul Lucas. There are three main differences between 241 and 243 heads. The first is the size of the combustion chamber, the 241 has a 67 cc, and the 243 has a 65 cc. The second is the port shapes. The 241's oval-shaped port has a 200 cfm intake, and the port on the 243 is D-shaped and offers better flow.

317's would kill your compression, get the 243's. The 243 chambers will make more power than the 241's or 317's, even if flow and chamber volumes are the same. You are correct, the 317 has a bigger chamber than the 241 & 243, thus dropping compression ratio. That being said I have seen a few 5.7's with 317's, and worked quite well.Jul 10, 2022 · You are much better off with the 706/862 heads from a compression standpoint. 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 5.3. The 706/862 respond very well to a light runner cleanup and a good multi angle valve cut.Mar 11, 2023 · Intake and Exhaust Ports. The intake and exhaust ports on the 243 heads are larger than those on the 799 heads, which allows for more air and fuel to enter the engine. This can result in higher horsepower and torque output. However, the smaller ports on the 799 heads can provide better velocity and airflow at lower RPMs, which can be beneficial ...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.

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.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 ...The Gen III have 862/706 Gen III heads, and the Gen IV have 243/799 heads. The 862/706 heads have smaller combustion chambers than the Gen IV, raising the compression ratio when swapped...…

Reader Q&A - also see RECOMMENDED ARTICLES & FAQs. Great cylinder-head airflow has been a key enabler of the LS-Ser. Possible cause: The 862 heads are a popular choice for those looking to increase the p.