Quote:
Originally Posted by Zeke3
First of all, welcome aboard!
The only difference I am aware is a very obvious one on the 49-53 flatheads in that the angle of helical gear is opposite direction so that the thrust of the camshaft was opposite of the early (32-48) engines.
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There is also a 32-33 crank gear and matching cam gear. Top set in pic is 32.