any heads over 72cc?
according to this chart, the 2001+ lq4 6.0 liter heads yield a compression ratio of 9.1 when swapping to a 5.7 liter engine, "this is the workhorse head for street/strip turbo and blower cars"
TECH Senior Member
Joined: Nov 2001
Posts: 10,341
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Kumar,
Be careful with manipulating gasket thickness. You want to maintain good quench/squish.
Often slightly higher comp with better quench is less prone to detonation that lower comp with poor quench.
Cheers,
Chris
Be careful with manipulating gasket thickness. You want to maintain good quench/squish.
Often slightly higher comp with better quench is less prone to detonation that lower comp with poor quench.
Cheers,
Chris
Originally Posted by kumar75150
im waiting on more kenne bell results
with a 74cc head and .074 cometic head gaskets, id be at 9.5-9.6:1
with a 74cc head and .074 cometic head gaskets, id be at 9.5-9.6:1
I would defentially not run that big of a gasket.
You can get down to 9.5:1 with no problem on a stock LS1 with a 74cc head.
9:1 will be tough. Anyways 9.5:1 will be fine.
Look at all the stock Z06's with 10.5:1 running FI.
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