| Runda | Tor | Data | Kierowca | Pojazd | Zespół |
|---|---|---|---|---|---|
| 1 |  Road Atlanta | 1973.03.15 | Porsche Carerra RS | Peter Gregg | |
| 2 | Lime Rock Park | 1973.05.05 | Porsche Carrera RS |  Bob Harmon Racing | |
| 3 | Watkins Glen | 1973.06.16 | Chevrolet Camaro | Carter Racing | |
| 4 |  Sanair | 1973.07.15 | Chevrolet Camaro | Hoselton Hugger | |
| 5 | Road America | 1973.07.28 | Chevrolet Corvette | John Greenwood Racing | |
| 6 | Edmonton Indy | 1973.08.19 | Chevrolet Corvette | John Greenwood Racing |