Re-hone or New Rings?

T56MaxTorq said

Moper - I want to avoid an overbore with new pistons. So rehoning and using moly rings is better than cast irons? Somehow I was under the impression that cast rings would seal up better on a used, honed bore. As for the 2nd ring, you're saying add .003-4 more gap to the stock, oem limitation?

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If you hone it with anything (dingle ball, a pro shop's equipment, whatever) run iron faced rings and expect they will need time to seat (400-500 miles). because the surface will be left very rough - rougher than moly rings should have. If you use my Scotchbrite deal, I would not use plain iron face because IMO, they may not ever seat. The moly top ring will help them seat on the lightly finished cylinder walls. I'll add I've done this on 5-6 engines over the years with no issues whatsoever.