Originally Posted by JW51
Isn’t the 54 engine the one with bottom end parts that are getting mighty scarce?

Main bearings are getting to be unobtanium, but it's a simple procedure to modify the block to accept mains for the 56-63 engines. Just a few minutes with a Dremel tool will make the block accept the later bearings. Pistons, rings, rod and cam bearings are all interchangeable, on early to late engines.
Jerry

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