The Stovebolt Site Forums The Parking Lot '60-'66 Trucks What years did the 235 require main bearing shims

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

Late 1955 235 engines still used shims.

I'll check the 56 through 58 manuals (if no one posts the year that shims were no longer used).

added later:
It looks like 1956 and newer 6-cylinder engines only required shims if a bearing cap was replaced. Maybe someone with more experience will chime in on this one. I did not need to use shims on my 1960 261 engine.

Thanks for the reply, The reason for the bearings being replaced is due to me finding a cap and bearing in the oil pan. looks like it had vibrated loose over time. I did not find any damage to the cap but did find wear to the bearing. The strange thing is that you would never have known that the cap had come loose. The motor was running fine with no knocking. The only thing that made me check was the oil preasure light comming on at idle.I figured the pump was going out. The 235 is a amzing engine. It kind of makes you wonder why Chevy hasn't built a up to date 235.

They kind of did. It's the 4.2l I-6 in the trailblazer.
I needed shims in my 61 235.