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Now Chuck grabbed a handful of assorted length 3/8-inch pushrods and installed the very cool Ultra Pro Magnum rocker arms from Comp. The pushrod length determines where the tip of the rocker arm hits the tip of the valve. Ideally you want it to fall just above center because when the arm starts to push down on the valve it move forward just slightly. After swapping in a few different sets Chuck had the right sizes, 7.900-inch for the intake and 8.800 for the exhaust.