Quote:
Originally Posted by pmrphil
But then again, John, if the lifters don't rotate, most likely the cam was ground incorrectly, probably not enough (or too much) taper on the lobe.
Luckily Mopars have a larger diameter lifter, that's a plus. 
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While they are called flat tappets, they are not, and they need to be matched to the amount of taper on the lobe.
Stan