How do I tell if my pistons are stock or aftermarket? Due to the casting number being at the distributor hole I think it's an early 67 400 which I believe had the 17 degree valve angle. I'm putting new edelbrock heads on which are 14 degrees. The way I understand it is that if I have aftermarket pistons the new 14 degree valves should clear the pistons. Am I on the right track? The heads I took off have 2.11 and 1.77 valves. Thanks.
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