[J-engine]

Harley Email Digest

Engine Picture Tutorial

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???   Flathead (1909-1936)
[j cross-section] J-type (1922-29)
[knuck cross-section] Knucklehead (1936-47)
[panhead cross-section] Panhead (1948-65)
[shovel cross-section] Shovelhead (1965-1984)
[evo engine] Evolution aka Blockhead (1984-1999)
???   Twin-Cam aka Fathead (1999 - present)

Other engines exist such as the Sportster "Ironheads".
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