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Old 05-08-2021, 08:52 AM   #4
mikep
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Join Date: May 2003
Location: 38 27' N 75 29' W
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If you lower the piston in the hole you lose any quench (the outer area on top where it almost hits the head, creating shock waves). No good. You want those shock waves to create turbulence and promote a good burn. The B series heads are bad enough, don't make your situation worse. I almost always try to bring the piston out of the hole with a thicker (.040") gasket. Piston to head clearance varies by diameter and opinion, btw.
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