Although the rods in my motor are based on a Chevy engine (2.220/0.990), they are not Chevy parts at all. They are 0.400" longer than a Chevy rod, and made by SCAT not GM. The rod bearings are made by Clevite to Chevy BB dimensions, so is that what you mean? And I have a Delco 10SI alternator made for GM in the '70s.