I heard the same posted by diamond20601 on August 24, 2011 at 05:35 PM
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The NA doesn't have bigger pistons (same dimensions) but has domed rather than dished piston tops, so compression is higher (10:1 vs 8.5:1). I read somewhere that you can safely boost an NA to the safety boost level (7 psi), but above that you risk severe detonation and damage. He may have done what i did, put in TT pistons. It would be interesting to see the details of his build.