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Although the Harley-Davidson 45 -- better known as the Flathead -- was designed as an entry-level big twin, its sturdy and dependable construction and unlikely racing pedigree made it one of the most prolific production powerplants in the history of motorcycles. Built and said from 1929 to 1973, the Flathead turned up in a wide range of Harley-Davidsons, from World War II military models to the utilitarian Servi-Car. The engine also became the power unit of choice among flat-track racers from 1934 to 1969. This new MBI Motorcycle Color History chronicles the entire development and production history of the Flathead, examining its application in street, racing, and military bikes. In addition to a selection of archival black-and-white photographs, the author features nearly 100 modern color shots of restored Harley-Davidsons powered by the Flathead.