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Jim Brierley · 10-10-2021, 11:35 AM

John, I think most, if not all, new replacement pistons are solid skirt. In general these require more piston-to-wall clearance than those with the full length split. Original Ford specs say "no more than .002" clearance", this can cause severe problems with modern pistons. I bore to .003" then hone another .0005" on stock rebuilds. For my street engines I bore to .004", then another .0005". On my Bonneville engine I have .009". Is it noisy? Not without a muffler, and at speed, I hear nothing but sweet music!

10-10-2021, 11:35 AM	#3
Jim Brierley Senior Member Join Date: Jun 2010 Location: Temecula, CA Posts: 4,091	Re: Piston question John, I think most, if not all, new replacement pistons are solid skirt. In general these require more piston-to-wall clearance than those with the full length split. Original Ford specs say "no more than .002" clearance", this can cause severe problems with modern pistons. I bore to .003" then hone another .0005" on stock rebuilds. For my street engines I bore to .004", then another .0005". On my Bonneville engine I have .009". Is it noisy? Not without a muffler, and at speed, I hear nothing but sweet music!