Harley-Davidson K model Engine 1952 - 1956
1952 was the first year of the Harley-Davidson K model, recognized by its unique Aluminum heads structure,.the new design flathead 45" ci. engine and its 4 speed gearbox integrated into one piece case for the first time in the history of H-D , the gearbox is close in its own compartment but not accessible through trap door which added only in 1954 together with higher compression and bigger 54" ci. displacement. known as the KH and KHK and competition models like the KR which wrote some pages in the American racing history, this engine will lead into the Sportster / Ironhead (XL) overhead valves engines with many similar features up to the 80's....