The Marcos GT is the name used by the British firm of Marcos Engineering Ltd for all of their cars until the introduction of the Mantis in 1970. Most commonly, the name is used to describe the very low coupé designed by brothers Dennis and Peter Adams. The car was first introduced as the Marcos 1800 in 1964, with a wooden chassis and a Volvo P1800 engine, although later models had a steel chassis and commonly Ford engines although others were also available. The majority of these sports cars were sold in kit form.