Overhead camshaft engines have the camshaft located in the cylinder head.

Overhead Camshaft Engines

Engines where the camshaft is located above the cylinder heads, directly operating the valves, which allows for more precise valve timing.

Camshaft

A crankshaft-driven shaft containing oblong-shaped lobes that push on valve lifters to open cylinder head valves.

Cylinder Head

The component of an engine that closes in the top of the cylinder, forming the combustion chamber and containing mechanisms such as valves and spark plugs.