Piston to head clearance, also known as quench or squish. It's the distance between the quench pad on the piston and the quench pad on the cylinder head when the piston is at TDC.
Much less than .035 and you risk piston to head contact at high RPM
Much more than .050 and combustion quality, mixture tolerance and detonation resistance all suffer.
Much less than .035 and you risk piston to head contact at high RPM
Much more than .050 and combustion quality, mixture tolerance and detonation resistance all suffer.
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