The most aggressive camshaft Brian Tooley Racing offers for GM LSA & LS9 engines. This cam is recommended when looking for more power than our Stage III application offers and has an ultra-aggressive idle. It is perfect for use in high RPM applications, or if using aftermarket or ported cylinder heads with overdriven superchargers. This cam uses ultra stable lobes for higher RPM potential, and has proven to be extremely durable in testing. Cam Motion 5150 cam core. Lift approaching .650" or more while using stock 15° rocker arms with too much open spring pressure can damage valve tips long term. We recommend maximum lift of .630" and maximum open pressure of 400 lbs when using stock rocker arms.