The name Harley-Davidson is all but guaranteed to come up when discussing (or even thinking about) motorcycles — particularly those made, or at least assembled, in the United States. It’s known for a number of quality motorcycles, but even some of its engines are stand-outs. Not all of Harley-Davidson’s engines are worth celebrating, however. Specifically, the company’s Twin Cam engine designs started out a little rocky to the point where Harley twin cams are almost treated as an urban
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