Harley-Davidson Engine Timeline.  The 1st four engines were in alphabetical order, that's how I remember.  Flathead, Knucklehead, Panhead, Shovelhead.

Harley-Davidson Engine Timeline. The 1st four engines were in alphabetical order, that's how I remember. Flathead, Knucklehead, Panhead, Shovelhead.

1947 Harley Davidson FL Knucklehead, one day when I have more time and money I will restore on of these.

1947 Harley Davidson FL Knucklehead, one day when I have more time and money I will restore on of these.

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