The revived version of Lime Rock Grand Prix in 2017 is what  North American auto racing series launched by the Sports Car Club of America
Lime Rock Grand Prix:  The revived version in 2017 is for the United States Auto Club Pirelli World Challenge. Pirelli World Challenge: The Pirelli World Challenge is a North American auto racing series launched in 1990 by the Sports Car Club of America.
Pirelli World Challenge