I grenaded my clutch this weekend, I haven't taken the car apart yet to determine the extent of the damage but I know at least the disk is shrapnel from the pieces the track crew handed me. I think its time to step up from a Powergrip HD to something that's a little heaver and tunable. The car is a 69 chevelle, BB427, 3800lbs, GForce GF5r, 4:11 gears with a 29X9 slick launching at 3k off a 2 step. The car only runs low 12s here in Colorado. Anybody have any recommendations on what clutch to use?