1937 - 1948 Harley-Davidson Big Twin Sidevalve Flatheads

 UL 74" FLATHEADS   Made 1937 - 1948     

         ULH 80" FLATHEADS   Made 1937 - 1941

       

 

1937 Models - First Year Production:

UL    ULH   

    

Note on this early 1937 UL motor the '30 - '36 type VIN Numbers/Letters-

Later 37 UL changed to Letters & Numbers used thru to later '40s 

 

   

 

 

 

1938 Models:     

             

 

1939 Model:

    

 

1940 Models:

       

 

 

1940 UA Military Model:

   

 

1941 Models:

                      

     

 

1941 Combination:

 

Rare 1942 Civilian Model:

 

 

Rare 1944 Civilian Model with update chrome:

   

 

Rare 1945 Civilian Models:

                     

      

Next Page >