Terms like DOHC, SOHC and OHV can sound confusing and ... to operate rocker arms that open and close the valves in the cylinder head. For the most part, a single overhead cam motor is a much ...

Of course, because there are DOHC motors, which are more complex ... the camshaft is in the cylinder head, above the valves, and the camshaft acts directly on the valves or on rocker arms that ...