The Ford GT40 is a high-performance endurance racing car commissioned by the Ford Motor Company. It grew out of the "Ford GT" (for Grand Touring) project, an effort to compete in European long-distance sports car races, against Ferrari, which won the prestigious 24 Hours of Le Mans race from 1960 to 1965. Ford succeeded with the GT40, winning the 1966 through 1969 races.

The effort began in the early 1960s when Ford Advanced Vehicles began to build the GT40 Mk I, based upon the Lola Mk6, at their base in Slough, UK. After disappointing race results, the engineering team was moved in 1964 to Dearborn, Michigan (Kar Kraft). The range was powered by a series of American-built Ford V8 engines modified for racing.

In 1966, the GT40 Mk II broke Ferrari's streak at Le Mans, notching the first win for an American manufacturer in a major European race since Jimmy Murphy's triumph with Duesenberg at the 1921 French Grand Prix.
In 1967, the Mk IV became the only car designed and built entirely in the United States to achieve the overall win at Le Mans.

The Mk I, the oldest of the cars, won in 1968 and 1969, the second chassis to win Le Mans more than once. (This Ford/Shelby chassis, #P-1075, was believed to have been the first until the Ferrari 275P chassis 0816 was revealed to have won the 1964 race after winning the 1963 race in 250P configuration and with a 0814 chassis plate. Its American Ford V8 engine, originally of 4.7-litre displacement capacity (289 cubic inches), was enlarged to 4.9 litres (302 cubic inches), with custom alloy Gurney–Weslake cylinder heads.

The "40" represented its height of 40 inches (1.02 m), measured at the windshield, the minimum allowed. The first 12 "prototype" vehicles carried serial numbers GT-101 to GT-112. Once "production" began, the Mk I, Mk II, Mk III, and Mk IV were numbered GT40P/1000 through GT40P/1145, and thus officially "GT40s". The Mk IVs were numbered J1-J12.

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