Cosworth has had a long relationship with the Ford Motor Company. This started when Cosworth started building racing engines in 1959. These engines were modified versions of the Inline-four Ford Kent engine for Formula Junior. Cosworth built a engine for the Lotus 7. and engines were built use in Formula B, sports car racing, and the Lotus Cortina. The final version of the Cosworth-Kent, in 1965, was the MAE. It was used in Formula 3 when engines were allowed. This was the dominate engine.