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What kind of rings are they? (brand...) I would use the ring manufacturers spec, with some modifications..lol. I run the tops at the "4 per inch of bore" rule and round up. So 4.355" would get an .018" top ring gap. Unless the piston requires differently. Diamonds don't take anything sprecial. I also run and extra thou per inch of bore on the 2nd ring. A lot has changed in the understanding of how rings work, and the 2nd ring with a larger gap can make more power and run cleaner.
 larger second ring gap has been shown to actually improve top ring seal. it allows combustion gases that have leaked past the top ring to escape past the second, preventing top ring flutter. also, a little too big is way better than a little too small. if the ends ever butt, you've got trouble.
for what is the good life if not doing things thoughtfully?
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