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Brian · 08-12-2016, 02:23 PM

Rule of thumb for end gap is .003"-.004" gap per inch of diameter of bore. So, your .010" is bottom limit, you'll be fine.
Sounds like an old NOS set of Ford rings. Use that expander under #2 ring. Fit the oil control ring in position 3

08-12-2016, 02:23 PM	#2
Brian Senior Member Join Date: May 2010 Location: Masterton, New Zealand Posts: 4,097	Re: Piston rings for a 221 c.i ? Rule of thumb for end gap is .003"-.004" gap per inch of diameter of bore. So, your .010" is bottom limit, you'll be fine. Sounds like an old NOS set of Ford rings. Use that expander under #2 ring. Fit the oil control ring in position 3 __________________ Unfortunately, two half wits don't make a whole wit!