COMP Cams Shaft Rocker System For GM L9Using COMP Shaft Mount Rocker Systems is one of the most effective ways to increase horsepower. These systems transfer power from the Camshaft to the valve by properly positioning the Rocker over the valve. Rather than being mounted on a Stud, a horizontal shaft works as the fulcrum, which significantly increases mounting stiffness and valve train stability. Constructed from high strength 2024 aluminum and using an 8620 hardened Steel shaft, COMP