A camshaft controls the height and the duration of lift for the valves in the heads of your engine. The distance a camshaft lifts the engine valves depends on the size of the camshaft lobes. As the camshaft turns, a pushrod moves along the lobe in an elliptical pattern. When the pushrod sits on the rounded section of the lobe, the valve sits in its closed position. As the pushrod moves over the
