Measuring the end gap is critical. .004 to .005" per inch of bore is needed. This can be greater for the scraper rails of the oil ring but not less. If a one piece oil control ring, it is the same. If the oil ring is 3 piece, a very crisp lower edge is needed on the ring compressor to assure a clean entry into the bore. A little cleaning up of the top edge of the bore with 300 grit paper to give it a tiny round edge can also help the transition into the cylinder. Jim
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