Unser, a three-time Indianapolis 500 winner and the 1978 IROC champion, held off late challenges by NASCAR aces Cale Yarborough and Bill Elliott to take the checkered flag by a 40-foot margin over ...

But, the concepts used in the series are very well noted. The cars used for IROC were different than any other series raced, just like the new car in NASCAR was one never seen before.

In the first season of IROC competition, 1974, the championship finale took place on the 3.81-mile road course, with the championship crowning events continuing from 1975 through 1978 on the 2.5 ...