Which component is designed as a single, heavy piece replacing multiple-part ball-type lifters?

• A. Pushrod
• B. Camshaft
• C. Lifter
• D. Timing Chain

Answer: (A)

This question is about how motion from the cam is transmitted to the valves in a traditional valvetrain. In many engines, the cam lobe pushes a lifter, and that motion needs to travel to the rocker arm that opens the valve. Instead of using several small ball-type lifters, a single, heavy piece—the pushrod—takes that motion from the lifter up to the rocker. The pushrod provides a strong, rigid link, which is important for keeping timing accurate and handling the forces without bending. The other components have different roles: the camshaft is the source of the cam lobes, the lifter is the part that directly contacts the cam, and the timing chain drives the camshaft. So the single heavy piece replacing multiple-part ball-type lifters is the pushrod.