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The original overhead valve or OHV Piston Engine was developed by the Scottish-American David Dunbar Buick . It employed Pushrod -actuated valves Parallel to the Piston s and this is still in use today. This contrasts with previous designs, which made use of Side Valves and Sleeve Valve s.

Today the technology is widespread, and the term, "OHV", is generally used to differentiate a Pushrod Engine from one which uses Overhead Cam s, although both types employ overhead valves and so are both OHV engines.


See also