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Harley Knucklehead Models

On this page you will find an overview of Harley Knucklehead Models as produced between 1936 and 1947. During these twelve years the Harley Davidson Motorcycle Company produced the Knuckleheads alongside the Flathead engines. In 1948 the Knucklehead engine was replaced by the Panhead engine.


Harley Knucklehead 1936 - 1947   E Models

 Year Model c.i. Compress. Type / Remarks
 1936-1947 E 61 Medium
 1936-1947 EL 61 High

Photo of 1936 Harley EL Knucklehead by Larry. In 1936, the Harley Davidson Motor Company introduced the EL model motorcycle with the 61 OHV engine which a bit later on came to be known as the "Knucklehead". This Over Head Valve V twin had a displacement of 61 cubic inches, or 1000cc.



Harley Knuckleheads 1941 - 1947   F Models

 Year Model c.i. Compress. Type / Remarks
 1941-1947 F 74 Medium
 1941-1947 FL 74 High

Photo of 1947 Harley FL Motorcycle with 1200cc Knucklehead OHV V twin engine by JFS. Here's a fine example of a classic 1947 Harley FL Motorcycle with 74 cubic inch (1200cc) Knucklehead Over Head Valve V twin engine.