In 1967, sports prototype racing was going through one of its golden eras, with plenty of entries and a wonderful driver lineup for the world championship series, which consisted of races in North America and throughout Europe. Seven different manufacturers contested the title with five of them winning races that year. The main protagonists were Ford, Ferrari, Chaparral, and Porsche, and perhaps to a lesser degree Mirage, Lola, and Alfa Romeo.
The Ford Motor Company decided to carry on using their 7-liter engine for 1967, but in two types of chassis, the MK2 and the MK4. Holman-Moody ran the MK2s, which were little changed from the previous year, and Shelby American was in charge of developing the new MK4. Both Ford Mks were heavy and needed all their 7-liters to achieve the performance required.
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