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Old 07-04-2020, 06:54 AM   #3
cadillac512
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Join Date: Apr 2019
Location: Kansas
Posts: 897
Default Re: 255 merc excessive ring end-gap?

A .040" set of rings is .010" larger in diameter than your .030" set. Multiply the .010" difference by Pi and you get approx .031" more circumference. Should be more than enough (with some filing) to solve your end gap problem.
However, 3.217 is correct for a .030" overbore on a stock 3.187 bore...so maybe it's actually worn a bit more than that or the rings are not what they should be?



Terry
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'41 Merc Town Sedan / 260" 8CM engine
'66 Fairlane four door / "warmed up" 302
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