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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.
A flathead engine (a.k.a. sidevalve engine (SV), flathead, or flatty) is an internal combustion engine with valves placed in the engine block beside the piston, instead of in the cylinder head, as in an overhead valve engine. As the cylinder cross-section has the shape of an inverted L, other names such as L-block or L-head are also common. The sidevalve's poppet valves are usually sited on one side of the cylinder. A recess in the cylinder head creates a corridor connecting the valves and the c