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With a shaft-mount system bolted in the stock location, the valvetrain geometry is fixed at the valve side of the rocker with a given valve length. The stock location and valve length gave us excellent geometry at the valve side, with the roller correctly sweeping across the valve tip. Varying the pushrod length, while keeping the lash constant, however, will change the angle made between the pushrod and the adjuster in the rocker. This will affect the lift at the valve.