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Jim Brierley · 07-31-2018, 10:56 AM

Not much! Stock pistons protrude above the block some, more if the block has been surfaced. You need a minimum of .030" of clearance between the piston and the head because the rods stretch when running, more so at high RPM.

07-31-2018, 10:56 AM	#4
Jim Brierley Senior Member Join Date: Jun 2010 Location: Temecula, CA Posts: 4,085	Re: Milling the head Not much! Stock pistons protrude above the block some, more if the block has been surfaced. You need a minimum of .030" of clearance between the piston and the head because the rods stretch when running, more so at high RPM.