Knucklehead, Flathead E, EL, F, FL, U, UL, UH, UHL / Harley-Davidson
- 1940-1947 Harley Davidson EL (Knucklehead)
- 1940-1947 Harley Davidson FL (Knucklehead)
- 1940-1947 Harley Davidson UL (Flathead)
- 1937-1947 Harley Davidson WL (Flathead)
Production year(s): 1940-1947, 1946, 1945, 1944, 1943, 1942, 1941
Engine: OHV 61ci and 74ci, SIDE VALVE 74ci and 80ci
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