I sorta like where they drill the oil hole on the top facing the intake hole in the crankshaft. That way it gets more fresh oil coming in more cool and hits the crankshaft on the way into the crankcase. This example is from a old Irvine .61 engine. But the oil hole could be either way, top of bottom as both methods work. I am not that fond of the narrow slit or cut in the rod. I see that as a point for failure as it weakens the rod more, but that would be with high RPMs or higher stress situations where it would be a issue.