With backing from Gulf Oil and their team manager J-O Bockman, Wyer created the Ford-powered Mirage M-1, a prototype that won the 1967 1000 km Spa. Due to a rule change that came in effect for 1968, prototypes were limited to 3,000 cc, while sportscars could have 5,000 cc if at least 50 were built. This applied to the two-year-old Ford GT40s, which were modified by Wyer. As a surprise, Wyer won the World Sportscar Championship for Ford in 1968 even though the 2,200 cc Porsche 907 were considered favourites at the beginning of the season. The superior power of the 302 cubic inch (4,942 cc) V8 in the GT40s allowed them to win on fast tracks, and especially at Le Mans two years in a row from 1968 (Pedro Rodríguez and Lucien Bianchi) and 1969 (Jacky Ickx and Jackie Oliver), even though they were outclassed at twistier tracks.