Quote:
Originally Posted by 40 Deluxe
It's OK to run a 4 ring piston with 3 rings. Just leave that superfluous bottom groove empty. That lower oil ring is not needed with modern three piece oil rings.
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I can confirm this. I left the bottom rings off the last engine I did and it runs just fine. I did, however, have the entire assembly balanced to account for the lighter piston assemblies.