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Is there a spring/retainer for the magnum head that can be used for a cam with lets say 520 or so lift that does not require machine work to the head?

Does anybody know what/if there are any differences between the different years and the pistons. Ex: i am wanting to replace a piston in a 01 5.9 . Can i use a piston from 97 ,or did they change them every so often. I read someplace that 2000 or 99 they lowered the compression to solve...

i have a unidentified camshaft , and was curious as to what it could be.i was told that it was a R.V cam when i purchased the motor. when i freshened up the motor, these were the numbers that i wrote down. it has CR on one side with a 936 , and what appears to be a date stamp of 09-19-90.it had...