The X-1 was a roadster built to contest the Fall 1965 North American Pro Series, a forerunner of Can-Am, entered by the Bruce McLaren team and driven by Chris Amon. The car had an aluminum chassis built at Abbey Panels and was originally powered by a 4.7-liter (289 ci) engine. The real purpose of this car was to test several improvements originating from Kar Kraft, Shelby and McLaren. Several gearboxes were used: a Hewland LG500 and at least one automatic gearbox. It was later upgraded to Mk.II specifications with a 7.0-liter (427 ci) engine and a standard four ratio Kar Kraft (subsidiary of Ford) gearbox, however the car kept specific features such as its open roof and lightweight aluminum chassis. The car went on to win the 12 Hours of Sebring in 1966. The X-1 was a one-off and was later ordered to be destroyed by customs officials.