Quote:
Originally Posted by Bill Pritchard
Correct for Z28s thru 73, and probably 74 as well.
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Actually, not correct for Z/28, 67-69. They use the 403.
Also not correct for ZL1. For some reason that application uses the 403.
70 and later (at least through the early 70s) Z/28 does use the 621, as does 70 and later LT-1 Corvette.