Which component may be offset to re-position the pushrod for intake runner modifications?

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

Answer: (B)

When the engine’s valvetrain is adjusted for modified intake runners, you adjust the line of motion from the cam to the valve by changing the pushrod’s position. The lifter is the part that sits on the cam lobe and pushes the pushrod up and down. By using an offset lifter, you can shift the position of the pushrod within the rocker‑arm interface. That offset changes where the pushrod lands at the top, allowing it to line up properly with the rocker and valve stem after the intake runners are modified. This helps maintain correct geometry and clearance, so the valve train operates smoothly.

The other components don’t provide this kind of positional adjustment. The timing chain keeps the cam and crank in sync, the camshaft provides the lobes that drive motion, and the pushrod follows the cam through the lifter to the rocker—without an offset lifter to alter its path.