The International Race of Champions was an auto racing competition, featuring identically-prepared stock cars set up by a single team of mechanics, in an effort to make the race purely a test of driver ability. It was run with a small field of invited drivers (6-12) from all the major racing series including NASCAR, SCCA, FIA and USAC. Over the years CART and the IRL drivers, among others also participated.

IROC, the International Race of Champions was a concept of Les Richter, Roger Penske and Mike Phelps in 1973. The idea was an auto racing competition, featuring identically-prepared stock cars set up by a single team of mechanics, in an effort to make the race purely a test of driver ability.

It was run with a small field of invited drivers (6-12) from all the major racing series including NASCAR, SCCA, FIA and USAC. Over the years CART and the IRL drivers, among others also participated.

The cars used in the first year were Porsche Carrera RSRs. Over the years the cars have included the Chevrolet Camaro (1975-89), Dodge Daytona (1990-93), Dodge Avenger (1994-95) and the Pontiac Trans Am (1996-2006). The series was not run in 1981, 1982, 1983 or 2007.

In 2007, IROC could not find a sponsor and closed down operations after almost 30 years of competition.

IROC - (1974-2006) Championsand Races