New and used Harley Davidson Knucklehead engines for sale by individuals, parts suppliers, and dealers. Officially called the EL series when it was introduced, this V-twin engine got its "Knucklehead" nickname from the unique shape of the valve covers, which resemble the knuckles of a clenched fist. The Knucklehead, introduced in 1936, was Harley-Davidson's first overhead valve V-twin engine, and it marked a major departure from the flathead engines that the company had been using.
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 1945 Harley Solo WL WLA 45 Knucklehead Flathead G *2247 Engine Motor Surplus $7,779.99 |
 1942 Harley 45 WL WLA Panhead Knucklehead Flathead *2065 Engine $4,179.99 |
 1954 Harley Solo WL WLA 45 Knucklehead Flathead G *2864 engine rough $2,779.99 |
 1937 Harley WL WLA Panhead Knucklehead Flathead Servicar G Engine *2516B $7,779.99 |
 1948 Harley Panhead Knucklehead Fl El Hydra glide OEM *2756A Engine Motor $18,879.99 |
 1961 Harley Panhead Knucklehead Fl Flh Duo Glide OEM *2549B Engine Motor $17,779.99 |