(OHV) Valves located in the head. A four-stroke engine with the intake and exhaust poppet valves located in the cylinder head and not at the side of the cylinder as in a side-valve engine. The valve stems are either at an angle or parallel and the valve discs face the piston, valve actuation pushrod and swing arm.
Typically used to describe an engine where the valves are positioned higher than the camshaft, such as in a small-block chevrolet V8 engine.
The head contains the valves, spark plugs, rocker arms and push rods.