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 Using a checking spring and an adjustable length pushrod to determine the pushrod length, Craig rotated the crank to get the cam on its base circle and installed the rocker arm and set it up so it’s nearly centered on the valve stem. Then he rotated the crank through the cam’s full lift while watching the sweep of the rocker arm. He says that to keep it as centered as possible throughout its travel, sometimes the rocker needs to start a bit off-center toward the lifter valley. When it’s in the center through its travel, the full lift of the cam is realized. If it’s too off-center, lift is reduced and the valve gets high side loads and prematurely wears the guides. The required pushrod length was 8.900 inches.