Several other manufacturers began to produce OHV engines, such as the 1906–1912 Wright Brothers Vertical 4-Cylinder Engine.Hobbs, Leonard S. The Wright Brothers' Engines and Their design. Washington, D.C.: Smithsonian Institution Press, 1971, p 61, 63. In 1911, Chevrolet joined Buick in almost exclusive use of OHV engines. However, side-valve engines remained commonplace until the mid-to-late 1960s, when they began to be phased out for OHV engines.
