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16 For high rpm stability, a stout valvetrain is a must. Panhandle chose to use a shaft-based rocker arm setup from Harland Sharp. Unlike an FE with a common shaft, the Twisted Wedge uses individual shaft stands for each pair of rockers. Due to the fact that Panhandle used 5.010-inch length valves in these heads versus the standard 4.960-inch length, geometry setup will be extremely critical.