1947 knucklehead frame

[kenny]

I am needing to find out what frame is correct for a future knucklehead project.I have a motor that is around 5200 serial number and im not sure if i need the early bull neck frame or mid year or the uu frame. Any help fellow members ?

[Jerry Wieland]

I am needing to find out what frame is correct for a future knucklehead project.I have a motor that is around 5200 serial number and im not sure if i need the early bull neck frame or mid year or the uu frame. Any help fellow members ?

My thought is that your engine number is right near the split I usually see between the bull neck frame and the early later neck. I doubt if anybody can nail it down exactly and I am sure that it was not a clean transition.

Jerry