GM rod/main bearings????

[Cheeseburger]

I want to make sure my crank is std/std without pulling it out.
The gm bearing numbers are:

Main:
GMM 400
18001493
204 C 632

Rod:
GMM4
258F632

Cannot find any info on gm engine bearing part numbers.

TIA.

 

[Steve V]

If they are not stamped .001 or .010 then they are standard size.

 

[Cheeseburger]

Ok, thanks for the info.

 

[turbofish38]

OEM factory installed bearings could be anything as they were in sizes not available over the counter. The factory clearances were usually spot on as far specs go. They used some really odd ball sizes, +-.0001,.0008 etc. Some of the bearings had the over/under size printed on them,most did'nt. Also the part numbers wont cross over into anything either. Since you did find numbers on yours that are GM than I can probally say your crank has standard journals.