Beginning in 1968, the rules governing sports car racing were changed and vehicles with engine displacement greater than 5 liters could no longer compete. These changes rendered the Mark II and Mark IV Ford GT40s with their 7-liter (427 cubic inches) V8 engines obsolete. However, the rule changes gave the older less-advanced Mark I GT40s with their smaller engines the opening they needed to continue racing.

This particular Ford GT40 Mark I, with the chassis designation P/1075 and wearing the iconic Gulf Racing livery, is legendary in motor racing history. It has the distinction of being one of the few cars to win overall at Le Mans in consecutive years, 1968 and 1969.

In 1968, chassis P/1075 in Gulf Racing livery and wearing the #9 was prepared and entered into the 24 Hours of Le Mans by John Wyer Automotive Engineering. The car was powered by Ford's small block 4.9-liter (302 cubic inches) V8 and piloted by Belgian Lucien Bianchi and Mexican Pedro Rodríguez. P/1075 won the race, completing 331 laps and covering a distance of 2767 miles at an average speed of 115.3 miles per hour. The qualifying results suggested the race would boil down to a fight between John Wyer's three Ford GT40s and the factory Porsche team's four new flat-8 powered 908s. These seven cars occupied the top nine starting positions on the grid, with the 908s starting first, second, and third and P/1075 starting fourth. The Porsche 908s had the early lead in the race, but three of the four cars were struck with electrical and mechanical problems forcing them to retire. Two of John Wyer's three GT40s also retired, the #10 suffered an engine failure and the #11 a broken clutch. By midnight, nine hours after the start of the race, Wyer's #9 GT40 P/1075 was in the lead and would go on to victory by a 5-lap margin. This marked the third victory in a row at the 24 Hours of Le Mans for Ford's GT40.

In 1969, under John Wyer Automotive Engineering's preparation, chassis P/1075 wearing the #6 was piloted once again to victory at Le Mans by Belgian Jacky Ickx and Englishman Jackie Oliver. This was the final victory at Le Mans for Ford's GT40, completing an impressive 4-year winning streak and cementing chassis P/1075's status in motor racing history.

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