littlebuddie-
I believe you! I couldn't find my old bearings and never thought to jot down the numbers of the new ones before I put them in.
If you can't find a number, just take the bearings to a bearing house or napa and with use of the book and a dial caliper they'll find the right bearing. Then, if you don't mind, post us the part number.
Another way of find the number might be to go to the dealership and have them give you the GM number, then you can take that number to Napa or whomever and they'll cross it into a part number for the line of parts they carry.
'51 Chevy 1/2 ton w/'62 261, HEI, offy, fentons, dual carter/webbers, t-5 & 12 bolt posi
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