Every so often, a race car comes along that flips the motorsport world upside down.

For the late ’60s and early ’70s, that car was the Porsche 917 - a machine so wild, so fast, that people thought it was from outer space.

The Ford vs Ferrari wars are coming to an end, with Ford’s 7-litre GT40 ruling supreme. But new rules were coming to kill off the big beasts, capping prototypes at 3 litres and sports cars at 5 litres.

So begins the tale of the greatest race car that was a monster masquerading as a sports car.