So my piston ring filer will be here shortly. I measured one of the file fit rings, only .006" gap! I need .020" or may another .003" top for future boost options and .0025" second and .010" minimum on the oil rails. I measured a couple of crank journals and used a snap gauge and micrometer with the bearings torqued in the main housing and rod. I found .0026" rods and .0028" mains for clearance. I asked for .0022 to .0025" rods and .0025" to .0028", those were Mark's recommendations. They are close enough. The balance shop micro polished the crank after the other shop cut it.