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Motorcycle Glossary Dictionary Term - Knucklehead

Knucklehead: Knucklehead is the name of the Harley-Davidson engine used from 1936-1947. If you sit on the seat of a knucklehead machine and look down to the right side of the engine, the rocker box looks like the knuckles on your fist. Check out the Harley-Davidson site to see pictures of their engines.

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