A cam follower is a general name for the component which transfers motion from the cam lobe to the valve stem. If the camshaft is position directly above the valve stems, the cam follower will probably be a bucket tappet, which provides a working surface for the cam lobe to act on, but does not alter the motion. If the cam is located to one side of the valves, the cam follower may be a rocking lever called a finger follower.