I was going to replace my rod and main bearings in a 1960 Chevy C-10 with the 235 eingine. I have ordered the rod bearings and when I ordered the main bearings the parts man added shims for the main bearings. I don't claim to know very much about the 235s. But from what I have found the 235 engines from 1955 and up did not require shims on the main bearings is this correct? The 235 in the truck I'm replacing bearings in is original to the truck. Thanks for any help