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An overhead valve engine (OHV engine) is an engine in which the valves are placed over the cylinder head. This was an improvement over the older flathead engine, where the valves were placed in the block next to the piston.
Camshaft Location: The camshaft in generally located in the cylinders head or engine block. Car engines which have the camshaft located in the cylinders head are called overhead cam (OHC) engine. There are two types of overhead cams engines they are Dual overhead cam and Single overhead cam. A dual overhead cam (DOHC) engine uses two camshafts, one for the intake valves and the other for the exhaust valves.