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Shaft Rocker Systems from Scorpion Performance, with more to follow.

Scorpion Shaft Rocker Arms
Scorpion Endurance Series Shaft Mount Rocker Arms are made for the most demanding endurance racing applications. This system creates optimal valve train performance and geometry by accurately positioning the rocker arm over the valve center line. The steel shaft functions as the fulcrum, which greatly increases rocker assembly stiffness and valve train stability. more info