| Title | knucklehead: 1936-1947 On the eve of WW2, Harley-Davidson® introduced an overhead- valve V-twin® with "knuckly" covers on the valves. Overhead valve EL-61cu 40hp Side valve-80cu |
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| Source | www.factoryfat.com |
| Category |
 Motorbikes |
| View | 1004 |
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