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Discussion Starter · #1 ·
I'm building a maximum of 9 lbs of boost (and I achieve that rarely) what is a good compression ratio for that amount of boost?

I ask because I'm looking at a set of GT40P heads and I understand that the combustion chamber is smaller and that will drive up my compression ratio from 8.8:1 to 9.5:1 (compared to the regular GT40 heads). Should I consider not getting the P heads?
 
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