wapp.....ive seen two trucks come through running the head studs and they both love them.......they have not had any issues, but now i dont know how they do if you just pull one bolt at a time and replace them without pulling hte head.....both of these guys pulled the heads and started with fresh gaskets so the torque sequence was right and also so there was not let off in any spot in the gasket.........you can run that motor WAY up in power.....and AFE has been building the best bolts on the market for years now.....so i have not doubt they work....its just the best install method for your dollar that is the unknown.........Marc