General Motors introduced two experimental steam-powered cars in 1969. One was the SE 124 based on a converted Chevrolet Chevelle and the other was designated SE 101 based on the Pontiac Grand Prix. The SE 124 had its standard gasoline engine replaced with a 50 hp power Besler steam engine V4, using the 1920 Doble patents, the SE 101 was fitted with a 160 hp steam engine developed by GM Engineering.[25] Power was transferred via a Toric automatic gearbox.