Originally Posted by BobK
I understand the issue with babbitt bearings but have never seen them. Can you tell from this photo which cap type this is?

Casting number is your best bet for identification. There are four designs ('37 to '47 #838102), ('48 - '53), ('53 PG - '55 first series) and then the second series design:
[Linked Image]

Image is from the GM Parts Wiki.

The Search function is quite good. In this case on the Group "0.095" limited to the Oct of '62 Parts & Accessories Catalog (P&A 30).