The Bill Thomas Cheetah was a sports car car built from 1963-1966 by Chevrolet performance tuner Bill Thomas as a competitor to Carroll Shelby's Cobra.
In 1963, Thomas gained covert support from GM (through the head of its Performance Product Group, Vince Piggins) to develop a concept vehicle. The prototype was designed jointly by Thomas and his lead fabricator at the time, Don Edmunds. Edmunds is also credited with the bulk of the construction of the car. Financing for the project came from private investors including Thomas himself and John Grow, a Rialto, California Chevrolet dealer.
Despite some adverse handling tendencies on road courses, few cars could catch it in a straight line due to its Thomas-built 377 cu in (6.2 L) displacement, dual air-meter, fuel-injected Chevy small-block V8 based engine. On the dragstrip, the car reportedly posted faster numbers than the Shelby 427 Cobra.