Quote:
Originally Posted by Jim Brierley
As John says, it is unusual for pistons to seize at the top, and as Dave says, you need more piston-to-wall clearance. Start with a new set of pistons, bore or hone cylinders and start fresh. I bore a stock engine to .003" clearance, then hone another .0005", more on performance pistons. You can safely bore to 4" if you want. Back in the day Ford said .002" maximum, that is way too tight with today's pistons.
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I agree with Jim regarding it is okay to bore to 4".
I intentionally bored my Phaeton to 4" (.125" oversize) when I installed inserts in it and 98,000 miles later, it is still running strong.
Update: Normal use will not require a high capacity radiator as Jim points out below.
Good Day!