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Harley-Davidson Engine Timeline. The 1st four engines were in alphabetical order, that's how I remember. Flathead, Knucklehead, Panhead, Shovelhead. http://kiwav.com/?utm_source=pinterest&utm_medium=organicpin&utm_campaign=hdenginetimeline #harleydavidson #harleydavidsonpanhead #harleydavidsonknucklehead #harleydavidsonshovelhead