The sixth year of IROC competition took place in 1978 and 1979. The format changed from IROC V in that three qualifying races were held for participants from NASCAR, USAC Champ Car, and Road Racing (which primarily consisted of Formula One, SCCA, and IMSA). The top four finishers in these qualifying races then earned the chance to race in the two final races at Riverside International Raceway and Atlanta Motor Speedway. IROC VI used the Chevrolet Camaro in all races. Mario Andretti won the road racing finale en route to the championship, and took home $75,000 for his efforts.
The final points standings were as follows:
| Position | Driver | Winnings | Series |
|---|---|---|---|
| 1 | Mario Andretti | $75,000 | Formula One'USAC Champ Car |
| 2 | Neil Bonnett | $28,500 | NASCAR Winston Cup |
| 3 | Cale Yarborough | $28,500 | NASCAR Winston Cup |
| 4 | Bobby Allison | $21,000 | NASCAR Winston Cup |
| 5 | Alan Jones | $20,000 | Formula One |
| 6 | Gordon Johncock | $19,000 | USAC Champ Car |
| 7 | Tom Sneva | $18,000 | USAC Champ Car |
| 8 | Emerson Fittipaldi | $17,000 | Formula One |
| 9 | Peter Gregg | $16,000 | IMSA Camel GT |
| 10 | Donnie Allison | $15,000 | NASCAR Winston Cup |
| 11 | Al Unser | $15,000 | USAC Champ Car |
| 12 | A. J. Foyt | ---1 | USAC Champ Car |