I put a Mopar Performance damper on my stroker engine over 10 years ago has a rubber ring like an original damper. I have a Sharpy mark on there to check if it slips and has not. Engine aint blown up yet but you'all got me wondering about my damper choice....Scat cast 4" crank.....I guess I am lucky....I wind it up pretty good on empty unpopulated country roads not been to any track and skinny all season radials cause aint built up chassis drive train enough for sticky tires...yet....