Which component is NOT needed in a typical overhead cam engine?

Here's why:

* Overhead Cam (OHC) engines: The camshaft is located directly above the valves, eliminating the need for pushrods to transmit motion.

* Pushrod engines: The camshaft is located lower down, and pushrods are used to transfer the camshaft's motion to the rocker arms, which then open and close the valves.

Let me know if you'd like more details on engine design!