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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:
1946 Models:
1946 "Barn Job":
1947 Models:
1948 Model - last year of Big Twins produced with 1936 type Spring Fork:
(a few 1949 Big Twins with SideCar reportedly came from the factory with Spring Forks)
Mix Match Bob Job:
UL Sport Bikes:
UL 1946 Sport Bike - Board Track Racer:
UL Police Bikes at FDR Funeral:
UL Choppers:
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