With the Ross pistons, using 0.020" on the top ring is pretty normal for a 4.36" bore. You can use from about 0.016 to 0.024" on the second ring with no ill effects. The current performance thinking is about 0.002-0.003" more gap on the second than the top ring.

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Please be quick

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I could have gave you this information a couple weeks ago, but you didn't post the question until the last minute!