All Results of Iso-Marlboro IR
Year: 1973
| Date | Race | No. | Chassis | Drivers | Entrant | Result |
| 29.4.1973 | GP Spain | 23 | #IR-02 | Howden Ganley | Frank Williams Racing Cars | DNF |
| 29.4.1973 | GP Spain | 24 | #IR-01 | Nanni Galli | Frank Williams Racing Cars | 11th |
| 20.5.1973 | GP Belgium | 25 | #IR-02 | Howden Ganley | Frank Williams Racing Cars | DNF |
| 20.5.1973 | GP Belgium | 26 | #IR-01 | Nanni Galli | Frank Williams Racing Cars | DNF |
| 3.6.1973 | GP Monaco | 25 | #IR-02 | Howden Ganley | Frank Williams Racing Cars | DNF |
| 3.6.1973 | GP Monaco | 26 | #IR-01 | Nanni Galli | Frank Williams Racing Cars | DNF |
| 17.6.1973 | GP Sweden | 25 | #IR-02 | Howden Ganley | Frank Williams Racing Cars | 11th |
| 17.6.1973 | GP Sweden | 26 | #IR-01 | Belsø / Ganley | Frank Williams Racing Cars | DNS |
| 1.7.1973 | GP France | 25 | #IR-02 | Howden Ganley | Iso Marlboro Williams | 14th |
| 1.7.1973 | GP France | 26 | #IR-01 | Henri Pescarolo | Iso Marlboro Williams | DNF |
| 14.7.1973 | GP Great Britain | 25 | #IR-02 | Howden Ganley | Frank Williams Racing Cars Ltd. | 9th |
| 14.7.1973 | GP Great Britain | 26 | #IR-01 | Graham McRae | Frank Williams Racing Cars Ltd. | DNF |
| 29.7.1973 | GP Netherlands | 25 | #IR-02 | Howden Ganley | Frank Williams Racing Cars | 9th |
| 29.7.1973 | GP Netherlands | 26 | #IR-01 | Gijs van Lennep | Frank Williams Racing Cars | 6th |
| 5.8.1973 | GP Germany | 25 | #IR-02 | Howden Ganley | Frank Williams Racing Cars | DNS |
| 5.8.1973 | GP Germany | 26 | #IR-01 | Henri Pescarolo | Frank Williams Racing Cars | 10th |
| 19.8.1973 | GP Austria | 25 | #IR-02 | Howden Ganley | Frank Williams Racing Cars | NC |
| 19.8.1973 | GP Austria | 26 | #IR-01 | Gijs van Lennep | Frank Williams Racing Cars | 9th |
| 9.9.1973 | GP Italy | 25 | #IR-02 | Howden Ganley | Frank Williams Racing Cars | NC |
| 9.9.1973 | GP Italy | 26 | #IR-01 | Gijs van Lennep | Frank Williams Racing Cars | DNF |
| 23.9.1973 | GP Canada | 25 | #IR-02 | Howden Ganley | ISO Marlboro Team-Frank Williams | 6th |
| 23.9.1973 | GP Canada | 26 | #IR-01 | Tim Schenken | ISO Marlboro Team-Frank Williams | 14th |
| 7.10.1973 | GP United States | 25 | #IR-02 | Howden Ganley | ISO Marlboro - Frank Williams (Racing Cars) Ltd. | 12th |
| 7.10.1973 | GP United States | 26 | #IR-01 | Jacky Ickx | ISO Marlboro - Frank Williams (Racing Cars) Ltd. | 7th |
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