One member emailed me when I was replacing mine and reported that a slipped dampner caused significant damage to his engine (because he kept advancing the timing). I have another cronie who spends a lot of time drag racing and he reports that it is not uncommon there. Spend two bucks on a piston stop and then one Saturday when you have nothing to do double check your TDC and put a paint line on your crank pulley and bolt. It couldn't hurt. That bottom shot is of my engine at TDC.
