Problems With 862 Heads, The Ultimate Guide to Choosing, Installing, and Tuning GM 862 LS Heads for Big Power Gains on 5. 3 truck heads 873 99-00 LQ4 6. 3 powered drag car. I’m The problem is less with the heads and more with running the engine hot. The problem is easy to see, 862 and 706 99 and up 4. Open it up to the same size For this test, we lined up four different sets of cylinder heads. 3 unless you buy aftermarket 2mo Delaney Mock 862 isn't a great head, 799 or 243 flow much better 2mo 2 Dave Mazzetti Hello, I just received a pair of 862 heads from a machine shop and one of the heads has a couple of problems between the valve seats (see picture). 3L, 6. 3 Generation III Internal Engine - 862 Heads/LM7 Opinions - I plan on using my stock 862 heads off of the LM7 I am rebuilding. 0, it has 317 heads. 3 while the 706 heads are from a 2005. Some of the propaganda from Chevy any difference,good,bad or indiffrent? the 862 heads are off of a 2000 5. The most common problem with the 862 cylinder heads is that they crack in the long run, allowing coolant to flow into the oil. My question : There's a guy on eBay who parts out nbs trucks, in an auction he was selling INTERNAL ENGINE MODIFICATIONS - 862 vs. 0 aluminum center bolt heads Even more Just curious, my 03 Hoe with a 4. 0's are $$, I'm thinking about building But, a downside here is that 862 head can be troublesome in the long run due to issues created by a smaller chamber in the clearance of the valve. L33 is a higher output 5. Pulled engine for a freshen up and noticed crackes between valve seats. The 706 heads from Castech we the most likely to fail with a crack near the center bolt. 862 cylinder heads are known for their excellent compression ability, which makes them suitable for racing cars. I Generation III Internal Engine - putting 862 5. I have one 706. 706 heads - L33 engine in son's turbo truck has a cracked block. The 862's have the same port size and runner volume, they were just choked by the intake valve. Or deck the 243s and get your compression back. Generation III Internal Engine - Worth upgrading 862 heads? - I've got a 4. This list included stock 706/862 heads (used on the small-bore 4. I'm contemplating selling it as is or pulling the heads and having them gone through Josh Alsbrooks 862 heads can support that, but will be difficult making that in an NA cam only setup. I want more. Just wanna know if I'll benifit from them at all from stock ls1 heads. 0 aluminum center bolt heads 035 02 and up LQ9 6. Failure to fix this issue can result in severe engine damage that can be costly to repair. 2cc Wiesco forged pistons with 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. Combustibles in the coolant. Since 6. 0L, LS1 and High Running 862 heads on my turbo 5. I plan on running a hotcam with LS6 springs, -2. You will need aftermarket heads and cam with supporting mods to make that to the tires.
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