A good motor builder buddy told me my pistons are to tight. We pulled one, pulled its rings off and slid it up and down the bore upside down. its tight. If we go with the 1" to .100 clearance, I should have .429 difference between my piston and wall. with .500runout on the crank we know the pistions can move .500 in the bore (lateral) so would i not want at least that much pistion to wall clearance? I get dam near the same read on my pistion and wall numbers. Pistion 4.292 Bore 4.352 .100-.200 with a cappy mic. what do you folks look for in pistion to wall clearance in a race motor? Thanks again for the time and advice. Merry Christmas!