Mark Romans wrote: > I have my piston to head clearance set at .039 inch! > 11.0 to one with efi, aluminum heads and 92 octane unleaded! > Mark I'm at .035-.037 depending upon the cyl, (pistons out of cyl .002-.003) with EFI and a measured 10.8+ with no problem. (and Standard Gold 93 octane unleaded!) Sharpe