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Old 08-06-2012, 10:46 PM
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IMHO, I second those gaps are too tight, especially for nitrous, and even a NA.

JE recommends:

Street turbo or nitrous, bore x .0050, bore x .0055 1st and 2nd rings and .015 oil. That's .020 and .022 for a 4.030 bore.

Nitrous race only even wider, .0070 and .0065 per inch of bore.

If you wanted tightening them up a bit, I would never go tighter than .0040 and .0045, top and second ring with NOS regardless of the ring material. Myself, I wouldn't deviate from the manufacturers recommendation.
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