​What would happen if you gathered some of the world’s best racing drivers from a range of disciplines, placed them in identically prepared cars, and let them battle it out on a selection of iconic North American racetracks? You wouldn’t have to wonder—because it actually occurred. The International Race of Champions, better known as IROC, brought together fans and competitors alike for a competition that ran from the early 1970s through the mid-2000s. It drew some of motorsport’s greatest talents, including legendary names like Mario Andretti, Dale Earnhardt, A.J. Foyt, and Al Unser Jr. The series did more than entertain; it helped inspire one of the most iconic American sports cars of the 1980s and left a lasting imprint on racing history.
The original IROC series continued through 2006, but its end came when sponsorship interest waned. Today, however, IROC is fondly remembered as a cornerstone of American motorsport, remembered not only for its on-track drama but also for the broader cultural impact it had. The legacy lives on through reunions and the possibility of a broader revival in the works, inviting fans to revisit a unique era of racing. Here’s a quick look at the enduring legacy of this beloved series.
IROC was founded in 1973 by Roger Penske, Les Richter, and Mike Phelps with the goal of creating a true all-star championship for the world of motorsport. The format pitted top drivers from NASCAR, IndyCar, and Formula One against each other in identically prepared machines, ensuring that victories depended on driver skill and team strategy rather than the superiority of a particular car. Over the years, IROC showcased competition on both oval tracks and road courses, including venues like Daytona, Talladega, and Watkins Glen.
The series began with the Porsche 911 Carrera, but soon shifted to the Chevrolet Camaro. After a brief hiatus in the early 1980s, IROC returned in 1984 with a new car built around the third-generation Camaro chassis. This change would reverberate beyond the racetrack. In 1985, Chevrolet introduced the cross-promotional IROC-Z Camaro, a version with enhanced performance and distinctive styling cues designed to capitalize on the series’ popularity. The IROC-Z remained in production through the 1990 model year, becoming a beloved icon for Camaro enthusiasts and a touchstone of 1980s car culture.
Following the Camaro era, IROC fielded Dodge Daytonas and Dodge Avengers during the 1990s, before concluding with the Pontiac Trans Am as its final car for the last 11 seasons. While the early years featured a balanced mix of oval and road-course racing, the latter part of the 1990s and into the 2000s leaned more toward ovals. Unsurprisingly, NASCAR drivers found particular success in this format, with Mark Martin earning the accolade of the most championships in IROC history at five, and Dale Earnhardt capturing four titles.
After the 2006 season, IROC ceased operations due to a lack of sponsorship. Complications also arose with sponsor agreements, as some drivers were reluctant to race—and potentially win—in a car from a manufacturer with whom they did not regularly compete, a concern tied to sponsorship expectations and brand alignment. Nevertheless, the IROC era left a lasting impression on American motorsport, preserving a distinctive chapter in racing lore that fans continue to celebrate through reunions and discussions of a possible revival.