Quote:
Originally Posted by L78steve
Late has GM and the 621 on the starter side. Early has this on top center and cannot be seen when installed.
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Late has GM on the top as well. I have three 621 bellhousings in my garage. This is the born with one from my 08D 69 SS396.
Edit: I just got home and checked the three that I have. Late must be considered after 1969 or 70. The other two 621s I have are stamped GM on the side unlike my original that's stamped on the parting line.
