OverHead Camshaft engines (OHC) have their camshafts positioned in the cylinder head above the combustion chamber. Valves are located in the roof of the combustion chamber to offer the same combustion related advantages as OHV engines.
The OverHead Camshaft layout builds on these advantages by reducing the number of valve train components and allowing them to be lighter and stronger, thereby making the engine more compact and lightweight overall.
By combination of an L-shaped rocker arm and single-cam camshaft, it has become possible to locate the cam pulley on the side of the cylinder head so that the overall engine height could be reduced in comparison to a conventional OverHead Camshaft engine.
By the use of an OHC mechanism and a timing belt in oil configuration, lubrication around the cam and the valves is done by the oil rotating with the belt.