The Knucklehead was Harley-Davidson’s first overhead-valve V-twin engine. Introduced in 1936, the original Knucklehead displaced 61 cubic inches, but a 74-inch version was added in 1941.
Though smaller in displacement than concurrent flathead models, the Knucklehead's overhead-valve configuration gave it more power. Incidentally, "Knucklehead" was not Harley's name for the motor (the factory called it the "61 OHV"). Riders gave it the "Knucklehead" nickname because its valve covers looked like fists with two knuckles sticking out.
Original paint, monochrome, watercolour on paper, 23 x 20 cm, by american artist Lee Bullock.
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