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4th gen with 862 heads

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Old Jun 19, 2019 | 09:35 PM
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Default 4th gen with 862 heads
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
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Old Jun 19, 2019 | 10:06 PM
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What cc is the head for the 4th Gen 5.3? Stock Gen3 862's are 66.67cc
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Old Jun 20, 2019 | 05:46 AM
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862 61.15. 3rd gen heads

243 64.45. 4th gen heads
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Old Jun 20, 2019 | 05:53 AM
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I'm thinking there is a difference in the piston but just wanna make sure
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Old Jun 20, 2019 | 10:13 AM
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Originally Posted by fastlt1
I'm thinking there is a difference in the piston but just wanna make sure
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.
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Old Jun 20, 2019 | 03:10 PM
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Originally Posted by 01CamaroSSTx
What cc is the head for the 4th Gen 5.3? Stock Gen3 862's are 66.67cc
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.
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Old Jun 20, 2019 | 06:26 PM
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[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
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