I havent herd of any coming loose, but also havent herd of much for miles on any of the bell users, and not to mention how much power do they make with there cars driving styles? I like to drive hard and put alot of miles on. I am just trying to be cautious. How hard are they launching? twisting on the pump bolts? I would have more faith if a couple guys with big power big blocks had some good runs down the 1/4 and lots of miles on the highway.