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The most important things are roundness, and no high spots. 4g’s have a good oiling system, just match viscosity of your oil to you clearances and usage.Fwiw we ran .0045” on the rods and mains in a 1300+hp build and it worked great in a drag...
Could be a lot of things more likely than a ring issue. Usually compression is a timing or valve sealing issue. Usually a cracked ring land will smoke at idle.