94155, RE: high compression n/a buildup Posted by Avenger, Dec-31-69 06:00 PM
12:1 CR pistons + .030 mill will net you around 13:1 CR or higher (I had a .030 mill on my car ... bumped up compression around 1 point). The copper HG if it is not the stock thickness will bump you up even higher. 12:1 car will run fine on 100+ octane. 13+:1 ... kinda crazy. Just FYI.
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