Spun dampener

Ive seen it on several GM motors. Most of the time it slips just enough to set the timing mark off. Balancers are one of those things that are often overlooked and taken for granted on a build. Definatly worth giving it a good cleaning and inspection for cracked elastomer or heavy seal area pitting/wear. Its an easy check after youve finished degreeing the cam to make sure everything is lined up. If youre going to be spinning the motor pretty, hard I think I would make a new quality sfi balancer part of the budget.