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[[Image:1941-Harley-Davidson-ULH.jpg|right|thumb|1941 Harley Davidson ULH]] | [[Image:1941-Harley-Davidson-ULH.jpg|right|thumb|1941 Harley Davidson ULH]] | ||
By 1937, all Harley-Davidson's [[flathead]] [[engines]] were equipped with [[dry-sump]] oil recirculation systems similar to the one introduced in the "[[Knucklehead]]" [[OHV]] engine. The revised 74 cubic inches (1,210 cc) [[Harley-Davidson V]] and [[Harley-Davidson VL]] models were renamed [[Harley-Davidson U]] and [[Harley-Davidson UL]], the 80 cubic inches (1,300 cc) [[Harley-Davidson VH]] and [[Harley-Davidson VLH]] to be renamed [[Harley-Davidson UH]] and [[Harley-Davidson ULH]].<ref name=Chronicle>{{cite book|author=Mitchel, D.|title=Harley-Davidson Chronicle - An American Original|pages=94-95|publisher=Publications International Limited|year=1997|isbn=0-7853-2514-X}}</ref> | By 1937, all Harley-Davidson's [[flathead]] [[engines]] were equipped with [[dry-sump]] oil recirculation systems similar to the one introduced in the "[[Knucklehead]]" [[OHV]] engine. The revised 74 cubic inches (1,210 cc) [[Harley-Davidson V]] and [[Harley-Davidson VL]] models were renamed [[Harley-Davidson U]] and [[Harley-Davidson UL]], the 80 cubic inches (1,300 cc) [[Harley-Davidson VH]] and [[Harley-Davidson VLH]] to be renamed [[Harley-Davidson UH]] and [[Harley-Davidson ULH]]. The 80 cubic inches (1,300 cc) flathead UH and ULH models were discontinued after 1941<ref name=Chronicle>{{cite book|author=Mitchel, D.|title=Harley-Davidson Chronicle - An American Original|pages=94-95|publisher=Publications International Limited|year=1997|isbn=0-7853-2514-X}}</ref> | ||
==See Also== | ==See Also== |
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