Harley-Davison motorcycles are known for their use of big V-twin engines. The company’s proprietary engine design has come a long way since the introduction of the first 49.5 cubic-inch version in 1909. Over time, V-twin engine varieties included some of the best Harley-Davidson engines ever made, such as the Flathead, Knucklehead, Panhead, Shovelhead, Evolution, Twin Cam, and Milwaukee-Eight. However, there were some issues along the way. Introduced in 1936, the Knucklehead represents a major milestone by introducing the Harley-Davidson
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