Final answer:
A DOHC engine has only one camshaft per cylinder head.
Step-by-step explanation:
A(n) DOHC (Dual Overhead Cam) engine has only one camshaft per cylinder head. In this type of engine, each cylinder head has two camshafts, one for the intake valves and one for the exhaust valves.
The purpose of the camshaft is to control the opening and closing of the valves in the engine. With two camshafts per cylinder head, the DOHC engine can provide better control over valve timing and improve engine performance.
DOHC engines are commonly found in high-performance vehicles because they allow for higher RPM (revolutions per minute) and more precise valve control.