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As the design of Harley-Davidson engines has evolved through the years, the distinctive shape of each model's valve covers has allowed Harley enthusiasts to classify an engine simply by looking for those shapes. The contours of a knucklehead engine's valve covers resemble knuckles on a person's fist.
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V-twin engine with two valves per cylinder. It was the third basic type of V-Twin engine used by Harley-Davidson, replacing the
Flathead-engined VL model in 1936 as HD's top-of-the-line model. The engine was manufactured until 1947 and was replaced by the
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This article is about a motorcycle engine. For the
Canadian punk rock band, see
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engine in 1948. The
Knucklehead-engined models were originally referred to as "
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Nickname that refers to a Harley-Davidson motorcycle engine
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