The Knucklehead is probably the most coveted Harley-Davidson engine among collectors and was built from 1936 to 1947. It was introduced after the Flathead engine, but both productions ran parallel for a long time. Successor of the engine available in 1200 and 1300 ccm became the also legendary Panhead. This gallery shows all our Thunderbike projects with Knucklehead engines.


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