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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.
We have separated these engines into three categories. 1  Side Valve Engines are designed for short run applications like cutting grass. 2  OHV Engines are quieter engines that produce less emissions.  OHVI Engines are the quietest and most efficient engines in their class.