fastlt1

iTrader: (4)

I was researching some. Both 5.3s 3rd gen and 4th gen have same 9.5 compression ratio. What would compression ratio be if you put 862 third gen head on a 4th gen 5.3

01CamaroSSTx

iTrader: (3)

What cc is the head for the 4th Gen 5.3? Stock Gen3 862's are 66.67cc

fastlt1

iTrader: (4)

862 61.15. 3rd gen heads

243 64.45. 4th gen heads

fastlt1

iTrader: (4)

I'm thinking there is a difference in the piston but just wanna make sure

G Atsma

Gen IV 5.3's with 243/799 heads W/O VVT have flat top pistons and 9.9:1 compression. The same WITH VVT have 3cc valve reliefs and 9.6:1 compression.

Darth_V8r

iTrader: (4)

You thinking of the 853? It was 66.7. The 862 was basically the same head as 706 just predate it. Flowed the same as a 241, also 66.7 cc.

01CamaroSSTx

iTrader: (3)

[QUOTE=Darth_V8r;20112772]You thinking of the 853? It was 66.7. The 862 was basically the same head as 706 just predate it. Flowed the same as a 241, also 66.7 cc.[/QUOTE

No I just had my numbers mixed up. Here's a link that may help!

https://sites.google.com/site/sloppy...flow-swap-info