An engine with the camshaft in the cylinder head will not require a __________.

An engine with the camshaft located in the cylinder head operates with a design known as an overhead cam (OHC) configuration. In this setup, the camshaft directly actuates the valves, eliminating the need for specific components that would be required in other configurations, such as a pushrod engine.

Pushrods are used in engines where the camshaft is positioned in the block, and they transfer the motion from the camshaft to the rocker arms, which then open and close the valves. Since an overhead cam engine has the camshaft directly above the valves, it can use a more direct mechanism to operate the valves without the intermediary step of transferring motion through pushrods. Therefore, the absence of a pushrod is a defining characteristic of engines with the camshaft in the cylinder head. This allows for more efficient valve control, often resulting in improved performance and timing accuracy.

In summary, the correct choice is that an engine with the camshaft in the cylinder head will not require a pushrod due to the direct actuation of the valves by the camshaft itself.