500, 472, 425, 368 Discussion, 500 crank fit 472? in Cadillac Engine Discussion; I've been reading various sources regarding the 472 and 500's. It sounds like they are very similar with the exception ...
Nevermind, I finally found the answer to my own question.
Q: Can I convert my 472 block to a 500? A: Any 472 can be converted to a 500 by changing the crank and pistons. 1968 and 1969 blocks will require notching at the bottom of the bore to clear the rod nuts.