The Canadian American Challenge Cup, co-sanctioned by the SCCA and the CASC, was essentially an “unlimited” series. Although there was a basic set of rules, the cars merely had to be two-seaters with bodywork covering the wheels, doors, a windscreen, brake lights and various safety requirements. There was no regulation on the cars’ dimensions, minimum weight, materials used or size of the tires, which was all left open to the creativity of the designer.
The nickname “unlimited” came from the regulations allowing engines of unlimited displacement and number of cylinders, i.e. horsepower. The Can-Am was the open sports racing car series, and it became a hotbed of new technology and racing car design.
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