How much can be done to these motors before the clutches start slipping? I am getting ready to install a 11:1 piston/stage 2 hot cam & spring kit in mine. I am running a FMF powerbomb w/ a white bros E slip on,Pro flow filter,no air box lid/stage 2 carb kit and a larger oil tank. If i have to get a better clutch i would like to get one and install it when i do the motor. I guess i would spend the money for the Hinson since they are the good stuff.