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  • HD cylinders

    hello
    can somebody tell me the difference between 1915 and later 1915 regarding cylinders
    i try to make comparaison using pictures but doesn't see any evidence!

  • #2
    compare the fins around the exhaust valve cover.
    15 are curved.
    16 & up are flat.

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    • #3
      thanks for your reply
      I don't understand clearly what you explain, when you sau exhaust valve cover , where is it ?

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      • #4
        Originally posted by knucklehead 61 View Post
        compare the fins around the exhaust valve cover.
        15 are curved.
        16 & up are flat.
        you are talking about the vertical or the horizontal fins?

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        • #5
          the horizontal fins near the bottom of the cylinder. they almost touch the valve spring cover on a 15, but are not close on 16 & up.

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