![]() With the iron Vortec heads' chamber design, you may be able to, as well. Then I changed the combustion chamber cc's to 64 to see what a head swap would do to your compression, It was 9.6:1.ĩ.6:1 Aluminum heads, you will still be able to run 87 octane. Gasket thickness (including deck height)=. I used a calculator I found online with a google search, and typed in numbers until I got a 350 with 8.5:1 compression.
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