Editing Overhead valve engine (section)

=== Production OHV engines ===
In 1898, bicycle manufacturer [[Walter Lorenzo Marr]] in the United States built a motorised tricycle powered by a single-cylinder OHV engine.<ref>{{cite book |title=Walter L. Marr, Buick's Amazing Engineer |first1=Beverly Rae |last1=Kimes |author-link1=Beverly Rae Kimes |first2=James H. |last2=Cox |publisher=Racemaker Press |location=Boston |year=2007 |page=14}}</ref> Marr was hired by [[Buick]] (then named ''Buick Auto-Vim and Power Company'') from 1899–1902, where the overhead valve engine design was further refined.<ref>"The Buick, A Complete History," third ed., 1987, Terry P. Dunham and Lawrence Gustin.</ref> This engine employed pushrod-actuated rocker arms, which in turn opened poppet valves parallel to the pistons. Marr returned to Buick in 1904 (having built a small quantity of the [[Marr (automobile)|Marr Auto-Car]], with one of the first known engines to use an overhead camshaft design), the same year that Buick received a patent for an overhead valve engine design. In 1904, the world's first production OHV engine was released in the [[Buick Model B]]. The engine was a [[flat-twin engine|flat-twin]] design with two valves per cylinder. The engine was very successful for Buick, with the company selling 750 such cars in 1905, and the OHV engine has powered almost all Buick automobiles since then.

Several other manufacturers began to produce OHV engines, such as the 1906–1912 [[Wright Brothers]] ''Vertical 4-Cylinder Engine''.<ref>Hobbs, Leonard S. The Wright Brothers' Engines and Their design. Washington, D.C.: Smithsonian Institution Press, 1971, p 61, 63.</ref><ref>{{Cite web|url=http://www.wright-brothers.org/Information_Desk/Just_the_Facts/Engines_&_Props/Wright%20Engines.htm|archive-url=https://web.archive.org/web/20160428085141/http://www.wright-brothers.org/Information_Desk/Just_the_Facts/Engines_%26_Props/Wright%20Engines.htm|url-status=dead|title=Wright Engines|archive-date=April 28, 2016}}</ref> In 1911, [[Chevrolet]] joined Buick in almost exclusive use of OHV engines.<ref>{{cite web | url=http://www.carnut.com/specs/gen/chv30.html | title=Chevrolet 1930s General Specs }}</ref> However, [[flathead engine|flathead]] "side-valve" engines remained commonplace in the U.S. until the mid-to-late 1950s,<ref>{{cite web | url=https://www.autoweek.com/car-life/a1713546/what-was-final-year-new-flathead-powered-american-car/ | title=What Was the Final Year for a New Flathead-Powered American Car? | date=20 December 2018 }}</ref> when they began to be phased out for OHV engines.