Description
A pushrod engine uses pushrods to transfer motion from the camshaft to the valves in the cylinder head. This design dates back to early internal combustion engines, where camshafts were positioned low in the engine block while valves sat at the top. Pushrods bridge that gap, converting camshaft movement into valve operation.
Modern pushrods are typically hollow to reduce weight and allow oil flow to the valvetrain, while performance engines require stronger designs to withstand high RPMs and heavy valve spring loads. Material choice, wall thickness, diameter, and end construction all affect strength and durability.
Although overhead cam engines eliminate the need for pushrods, pushrod engines remain common and are a popular upgrade choice when rebuilding or improving older engines.