(Qualifying Results)
| Pos. | No. | Drivers | Car | Entrant | Q Time | Km/h |
| 1st | 8 | Jerry Grant | Lola T70 Ford | All American Racers | 1:15.0000 | 177.6716 |
| 2nd | 26 | John Fulp | Lola T70 Mk.2 Chevrolet | Raceway Engineering, Inc. | 1:16.2000 | |
| 3rd | 6 | Mark Donohue | Lola T70 Mk.2 Chevrolet | Roger Penske Racing Enterprises | 1:16.4000 | |
| 4th | 96 | Mike Goth | McLaren Elva Mark IB Chevrolet | Mike Goth Racing | 1:16.4000 | |
| 5th | 0 | Chuck Parsons | Genie Mk X Chevrolet | Hilton Racing Team | 1:17.1000 | |
| 6th | 77 | Mak Kronn | McKee Mk.6 Chevrolet | Honda of Waukegan | 1:18.7000 | |
| 7th | 65 | Ed Hamill | Hamill SR3 Oldsmobile | Hamill Cars, Inc. | 1:17.1000 | |
| 8th | 29 | Bob Bucher | Lola T70 Mk.2 Ford | Young B.A.R.F. Racing Team, Inc. | 1:19.8000 | |
| 9th | 3 | Ludwig Heimrath | McLaren - Ford | | 1:19.9000 | |
| 10th | 62 | John Cannon | Genie Mk X Oldsmobile | Dan Blocker Motor Racing, Inc. | 1:20.0000 | |
| 11th | 52 | Bill Eve | Genie Mk X Ford | Eve & Jones Racing | 1:20.3000 | |
| 12th | 17 | Lothar Motschenbacher | McLaren Elva Mark II Oldsmobile | Lothar Motschenbacher | 1:20.3000 | |
| 13th | 31 | Don Skogmo | Genie Mk VIII Chevrolet | Don R. Skogmo | 1:21.6000 | |
| 14th | 7 | Joe Buzzetta | Porsche 906 | Porsche Corp. of America | 1:22.4000 | |
| 15th | 95 | Eppie Wietzes | Ford GT40 | Comstock Racing Team | 1:21.3000 | |
| 16th | 64 | Oscar Koveleski | Cooper - Chevrolet | Auto World | 1:21.3000 | |
| 17th | 9 | Skip Hudson | Lola T70 Chevrolet | T. M. I. Associates | 1:22.6000 | |
| 18th | 75 | Bob Montana | McKee Mk V Plymouth | Bob Montana | 1:23.3000 | |
| 19th | 56 | Ralph Trieschmann | Porsche 906 | | 1:23.6000 | |
| 20th | 57 | Chuck Dietrich | Elva Mk VII S BMW | Suzy Dietrich | 1:23.6000 | |
| 21st | 4 | Peter Gregg | Porsche 906 | Brumos Porsche Corp. | 1:23.9000 | |
| 22nd | 48 | Skip Barber | Brabham BT8 Climax | | 1:24.1000 | |
| 23rd | 15 | Herb Wetanson | Porsche 906 | Herb Wetanson | 1:24.3000 | |
| 23rd | 23 | Doug Revson | Lotus 23 Climax | Douglas Revson | 1:24.3000 | |
| 24th | 88 | Harold Keck | Shelby Cobra Ford | Archway Ford, Inc. | 1:25.2000 | |
| 25th | 46 | John Morton | Lotus 23 Porsche | | 1:25.6000 | |
| 26th | 12 | George Wintersteen | Chevrolet Corvette Grand Sport | Wintersteen Racing, Inc. | 1:26.1000 | |
| 29th | 41 | John Dennis | Denmacher II | Suburban Racing Team | 1:28.4000 | |
| 30th | 1 | Charlie Kolb | Porsche 906 | Schroeder Imported Motor Corp. | 1:30.0000 | |
| 31st | 42 | Candido DaMota | Lotus - Climax | Candido DaMota | 1:30.4000 | |
| 32nd | 19 | Ed Hessert | Elva Mk VII Ford | Dr. E. C. Hessert | 1:33.6000 | |
| 33rd | 81 | Alvin Forsyth | Chevrolet Corvette | Alvin M. Forsyth | 1:34.0000 | |
Other present cars:
| No. | Drivers | Car | Entrant |
| 33 | Scooter Patrick | Porsche 906 | |
| 87 | Bill Bowman | Porsche 906 | William S. Bowman |
| Ken Miles | Porsche 906 | |
Entered cars that did not arrive:
| No. | Drivers | Car | Entrant |
| 11 | Chuck Sarle | Piranha | Charles R. Sarle |
| 14 | Bob Nagel | Elva - BMW | Robert J. Nagel |
| 39 | Charles Cox | McLaren Elva Mark II Chevrolet | Charles Cox |
| 44 | Jerry Hansen | Wolverine | Jerry Hansen |
| 45 | Rick Muther | McLaren Elva Mark I | James A. Linen, IV |
| 47 | Bob Brown | Lola T70 Mk.2 Chevrolet | Robert R. Brown |
| 69 | John Keane | N & B Special | N & B Automotive |
| 72 | George Ralph | Elva Mk VIII BMW | Fred Opert Racing Enterprises |
| 73 | Fred Ashplant | Elva Mk VIII BMW | Fred Opert Racing Enterprises |
| 92 | Chuck Akins | Bobsy SR3 | Ecurie Oh!! Good Grief |
| 97 | Charlie Hayes | McLaren Elva Mark II Chevrolet | Charles Hayes Racing |
| 99 | Steve Diulo | Lotus 19G | Steve Diulo |
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