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nick c · 07-16-2020, 09:04 AM

Last week I milled a stock head to the fly cut then removed all traces of the fly cut ( .125"). the old gasket measured .070" thick, The new BEST gasket measured .080" new. On this forum it has been said you need .035" to .040" clearance between piston and head. I disagree with Les Andrews. All pistons protrude 1/32". Most all rebuild kits have a copper gasket that measures approximately .080".
My compression went from 70 psi to 80 psi in all cylinders. I fell the improvement when accelerating.

07-16-2020, 09:04 AM	#8
nick c Senior Member Join Date: Aug 2010 Posts: 260	Re: Piston protrusion Last week I milled a stock head to the fly cut then removed all traces of the fly cut ( .125"). the old gasket measured .070" thick, The new BEST gasket measured .080" new. On this forum it has been said you need .035" to .040" clearance between piston and head. I disagree with Les Andrews. All pistons protrude 1/32". Most all rebuild kits have a copper gasket that measures approximately .080". My compression went from 70 psi to 80 psi in all cylinders. I fell the improvement when accelerating.