Bottom End Shocker Build

rumblefish360 said
I forget who it is exactly, though Hughes engines offer them, but someone makes spacers for the larger 360 mains for use with the smaller main cranks. They should take a light hone according to Hughes.

I have never seen shims for the mains. Over and under sized bearings, yes.

I saw a guy shimming bearings on an old chevy that had babbit built rods , a long long time ago, was doing it because of rattle and oil consumption , and it worked !