(All Session Laps)
| Pos. | No. | Drivers | Car | Entrant | All Best | Q Time |
| 1st | 2 | Rodriguez / Kinnunen | Porsche 917 K | J. W. Automotive Engineering, Ltd. | 1:04.900 | 1:06.6000 |
| 2nd | 1 | Siffert / Redman | Porsche 917 K | J. W. Automotive Engineering, Ltd. | 1:06.300 | 1:06.3000 |
| 3rd | 92 | Andretti / Giunti | Ferrari 512 S Spyder | Ferrari S.P.A., SEFAC | 1:06.600 | 1:06.6000 |
| 4th | 91 | Schetty / Ickx | Ferrari 512 S Spyder | Ferrari S.P.A., SEFAC | 1:07.600 | 1:07.6000 |
| 5th | 35 | van Lennep / Larrousse | Porsche 917 K | International Martini & Rossi Racing Team | 1:08.200 | 1:08.2000 |
| 6th | 32 | Attwood / Ahrens, Jr. / *Hulme | Porsche 917 K | Porsche Audi Division | 1:08.700 | 1:08.7000 |
| 7th | 31 | Elford / Hulme / *Ahrens, Jr. | Porsche 917 K | Porsche Audi Division | 1:08.800 | 1:08.8000 |
| 8th | 50 | Bonnier / Wisell | Lola T70 Mk.3B GT Chevrolet | Ecurie Bonnier | 1:11.200 | 1:11.2000 |
| 9th | 6 | Siffert / Kinnunen / Rodriguez | Porsche 917 K | J. W. Automotive Engineering | 1:12.100 | 1:12.1000 |
| 10th | 36 | Marko / Lins | Porsche 908/02 | International Martini & Rossi Racing Team | 1:12.600 | 1:12.6000 |
| 11th | 8 | Dean / Revson | Porsche 908/02 | A. G. Dean | 1:17.400 | 1:17.4000 |
| 12th | 46 | Christian / Reynolds / Rinzler | Chevron B16 Ford | Baker Motor Company | 1:19.500 | 1:19.5000 |
| 13th | 20 | Barker / Greenwood | Chevrolet Corvette 427 | John Green Wood | 1:21.100 | 1:21.1000 |
| 14th | 53 | Wise / Frank / *Rahal / *Mansfield | Porsche 906 | Nationwide Food Brokers Racing Team | 1:22.500 | 1:22.5000 |
| 15th | 52 | Rosen / Jacobs | Porsche 906 | Volkswagen North Central | 1:23.500 | 1:23.5000 |
| 16th | 45 | Richards / Baker | Chevron B16 Ford | Baker Motor Company | 1:24.200 | 1:24.2000 |
| 17th | 5 | Grossman / Yenko | Chevrolet Camaro 427 | Mallbank Racing | 1:25.700 | 1:25.7000 |
| 18th | 41 | Bandy / Cargill | Lotus 47 | Sport Motors | 1:26.300 | 1:26.3000 |
| 19th | 37 | Duval / Nicholas | Porsche 911 T | Sunoco | 1:28.400 | 1:28.4000 |
| 20th | 94 | Meaney / Behr | Porsche 914/6 | Ralph Meaney, Inc. | 1:28.800 | 1:28.8000 |
| 21st | 39 | Brezinka / Petermann / Bartling | Porsche 906 | Rainer Brezinka | 1:29.800 | 1:29.8000 |
| 22nd | 63 | Luebbe / Summers | Chevrolet Corvette 427 | Robert V. Luebbe | 1:30.500 | 1:30.5000 |
| 23rd | 70 | Wicky / Garant | Porsche 911 T | Silvain Francois Garant | 1:30.600 | 1:30.6000 |
| 24th | 84 | Wright / Grant | Porsche 911 S | Ralph Meaney, Inc. | 1:30.800 | 1:30.8000 |
| 25th | 77 | Tullius / Jennings | Porsche 911 T | Toad Hall Racing | 1:37.000 | 1:37.0000 |
Other present cars:
| No. | Drivers | Car | Entrant |
| 23 | Schumacher / Johnson | Chevrolet Corvette 427 | William A. Schumacher |
| 33 | Loos / Pesch | Ferrari 512 S | Gelo Racing Team |
Entered cars that did not arrive:
| No. | Drivers | Car | Entrant |
| 30 | Netterstrom / Bailey | Porsche 911 | Jim Netterstrom |
| 38 | Wonder / Cuomo | Ford GT40 | William M. Wonder, Inc. |
| 40 | Walle / Rubenstein | TVR Vixen Ford | Walle Enterprises |
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