Harley-Davidson 'Knucklehead' (1936 to 1947)

1936 was the first year for the Model E, which was nicknamed as the "knucklehead" due to the knuckle shape of its engine valve covers. The Model E was a slowly gained popularity, but it was the distance record set by Fred Ham that put the knucklehead Model E into the history books.

1947 Harley-Davidson E Knucklehead
1937 Harley-Davidson Model E Knucklehead



1947 Harley-Davidson EL 1000
1937 Harley-Davidson EL 1000 Knucklehead



1947 Harley-Davidson EL 1000
1940 Harley-Davidson EL 1000



1947 Harley-Davidson EL 1000
1947 Harley-Davidson EL 1000

The last of the 'Knuckleheads' was produced by Harley-Davidson in 1947. The new versions of Harley's OHV engine were introduced in 1948, featuring chrome-plated valve covers that resembled upside-down cake pans. This was the beginning of Harley-Davidson's "Panhead" era.


1947 HD EL 1000cc V-Twin Engine

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