Here is the scenario. A couple years ago, was at a track rental day, and on pass #5 the trans rolled the sprag. What sucks is the car owner and his buds all convinced me to remove the high side chip cuz they swore I was bouncing it off the limiter at the top of 1st and 2nd (yes i know i should have never listened to them). Anyway i let go of the button at 4800 so who knows where the engine ended up. Dragged the car back to the shop, checked all the lash (which was fine) and all valvetrain opened/closed as it should. Fast forward to 3 weeks ago after finally getting the trans back together, I took the car out. All sounded good, revved quick, no popping/banging/back firing. First and only pass it goes 10.62 @125. The last pass it made before it rolled the sprag was 10.07 @ 132 in virtually the same adjusted altitude. Thought the converter was hurt cuz it was lazy through all gears so I sent it back to ATI and they said all was good. WTF i thought. So after discussion with my machine shop the thought is the valve springs were damaged when it buzzed the motor 2 years ago. Anybody ever deal with something like this? .5 tenths seems to be alot to lose, and ruining all 16 springs seems even more hard to believe. Sorry for the long post but I wanted to make sure i covered the scenario as much as i could.