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i had the same thing happen with an MP 484 smallblock cam .

you better get out the wrenches because when that happenes it stops the lifter from rotating and flattens the cam lobe in short order , the reason for your rough running issue .

motor has to come out and be completely gone thru , metal is everywhere




I don't think I damaged the cam yet. The lobe looks good. The motor hasn't run long enough to do any damage, hopefully



i'll assume you pulled the intake and took a good look at the cam ?