Early 1947 blocks had the fuel pump located on a different part of the block because of vapor lock problems, late 1947 offered a two barrel carb. and manifold, heads were changed over the years and a supercharger was offered starting in 1954. Some of the engines were made by Continental but when Continental could not keep up with the needs of K.F., K.F. built their own engine plant in Detroit and made the engines themselves. There are other changes made through the years. The basic 226 was developed in the early 1930's and was used after KF for various power plants, industrial engine applications and by Checker motors into the 1960's.