| 1st | 8 | Foyt / Wollek / Unser / Boutsen | Porsche 962 | Henn's Swap Shop Racing | 703 | 4027.6731 kms | 167.6325 | | 1st | GTP |
| 2nd | 14 | Holbert / Unser, Jr. / Bell | Porsche 962 | Holbert Racing | 686 | | | | 2nd | GTP |
| 3rd | 67 | Busby / Knoop / Mass | Porsche 962 | B.F. Goodrich | 674 | | | | 3rd | GTP |
| 4th | 5 | Stuck / Akin / Miller | Porsche 962 | Bob Akin Motor Racing | 670 | | | | 4th | GTP |
| 5th | 7 | Mullen / Nierop / McIntyre | Porsche 935-84 | Bob Akin Motor Racing | 668 | | | | 5th | GTP |
| 6th | 2 | McKitterick / Wolters / Leon | March 84G Chevrolet | Leon Bros Racing | 654 | | | | 6th | GTP |
| 7th | 1 | Whittington / Lanier / Leon | March 85G Porsche | Leon Brothers Racing | 652 | | | | 7th | GTP |
| 8th | 65 | Dallenbach, Jr. / Jones / Bundy | Ford Mustang | Roush Protofab | 637 | | 151.7499 | | 1st | GTO |
| 9th | 9 | Newsum / Baker / Mead / Tilton | Porsche 935 K3 | Personalized Autohaus | 624 | | | | 8th | GTP |
| 10th | 93 | Marsh / Pawley / Marsh | Argo JM16 Mazda | Mid-O/Rusty Jones | 602 | | 143.3571 | | 1st | Lights |
| 11th | 53 | Smith / Waugh / Febles | Mazda RX-7 | Mandeville Auto-Tech | 599 | | | | 2nd | GTO |
| 12th | 71 | Johnson / Dunham / Terada | Mazda RX-7 | Team Highball | 599 | | 142.7182 | | 1st | GTU |
| 13th | 63 | Downing / Maffucci / Katayama | Argo JM16 Mazda | RGP 500 Racing | 599 | | | | 2nd | Lights |
| 14th | 09 | Schaefer / Uria / Refenning / Figaro | Porsche Carrera RSR | 901 Shop | 586 | | | | 3rd | GTO |
| 15th | 90 | Delano / Petery / Riggins | Pontiac Firebird | Road Circuit Tech | 578 | | | | 4th | GTO |
| 16th | 21 | Cohen / Walker / Gelles | Ferrari 512 BB/LM | Gopher Motion | 567 | | | | 5th | GTO |
| 17th | 6 | Morgan / Alsup / Miller | Royale RP40 Buick | Morgan Performance | 564 | | | | 9th | GTP |
| 18th | 42 | Pruett / Lewis / Varde | Mazda RX-7 | Mike Meyer/Daffy SWR | 558 | | | | 2nd | GTU |
| 19th | 99 | Cord / Aase | Toyota Celica | All American Racers | 533 | | | | 3rd | GTU |
| 20th | 92 | Gennone / Prego / Overbagh / Fuller | Chevrolet Camaro | OMR Engines | 516 | | | | 6th | GTO |
| 21st | 11 | Kendall / Fitzgerald / Hotchkis | Porsche 935 K3/80 | Kendall Racing | 512 | | | Burnt piston | 10th | GTP |
| 22nd | 30 | Moretti / Trueman / Sigala | Alba/Momo AR5 Ford | Momo Corse | 505 | | | Fire | 11th | GTP |
| 23rd | 37 | Welter / Nicholson / Burdsall | Tiga GT284 Mazda | Aerex Manufacturing | 501 | | | | 3rd | Lights |
| 24th | 96 | Moffat / Hansford / Bartlett / McCloud | Mazda RX-7 | Allan Moffat Racing | 482 | | | | 7th | GTO |
| 25th | 94 | Phalf / Winfree / Hopkins | Porsche 911 | 49th Star Racing | 477 | | | | 4th | GTU |
| 26th | 73 | Howey / Koch / Wolf | Chevrolet Camaro | Wolf Engines | 467 | | | | 8th | GTO |
| 27th | 78 | Garcia / Matienzo | Pontiac Firebird | Superior Racing Team | 454 | | | | 9th | GTO |
| 28th | 3 | Allison / Pickering / Madren | March 84G Buick Turbo | Pegasus Racing | 437 | | | Gearbox | 12th | GTP |
| 29th | 83 | Wessel / Whitaker / Kennedy / Keck | Chevrolet Corvette | K & P Racing | 436 | | | | 10th | GTO |
| 30th | 43 | Schmidt / Schmidt / Schmidt | Chevrolet Corvette | Starved Rock Lodge | 413 | | | | 11th | GTO |
| 31st | 35 | Speer / Hefner / Griffin | Porsche Carrera RSR | Team Dallas | 395 | | | Oil leak | 12th | GTO |
| 32nd | 15 | Kalagian / Lloyd / Grunnah | March 84G Chevrolet | Kalagian Racing | 394 | | | Suspension | 13th | GTP |
| 33rd | 33 | Anderson / Boand / Brummer | Lola T600 Chevrolet | Bo-And Racing | 373 | | | Suspension | 14th | GTP |
| 34th | 22 | Taylor / Hayes-Harlow / Lee | Pontiac Firebird | Walter Johnston | 351 | | | | 13th | GTO |
| 35th | 49 | Naon, Jr. / Vitolo / Garcia | Porsche 911 | Conrad Racing | 336 | | | | 5th | GTU |
| 36th | 45 | Paul, Jr. / Adam / Ganz | March 85G Buick | Conte Racing | 330 | | | Suspension | 15th | GTP |
| 37th | 80 | Bonnet / Derhaag / Lindley | Chevrolet Camaro | Lindley Motor LTD | 295 | | | DNF | 14th | GTO |
| 38th | 72 | Shafer / Nehl / Painter | Chevrolet Camaro | Centurion Auto Trans | 283 | | | Head gasket | 15th | GTO |
| 39th | 28 | Baker / McCall / Ruttman | Chevrolet Corvette | Southern Racing Promo | 281 | | | DNF | 16th | GTO |
| 40th | 0 | van der Merwe / Martin / Scheckter | March 84G Porsche | Kreepy Krauly Racing | 260 | | | Tyre | 16th | GTP |
| 41st | 38 | Yorino / Blackburn / Mandeville | Mazda RX-7 | Mandeville Auto-Tech | 220 | | | Exhaust | 17th | GTO |
| 42nd | 81 | Alexander / Hill / Alderman | Ferrari 308 GTB | Mosler Racing | 219 | | | DNF | 6th | GTU |
| 43rd | 89 | "Jamsal" / Galdamez / "Anbagua" | Porsche 934 | Scorpio Racing | 217 | | | Electrics | 18th | GTO |
| 44th | 55 | Peters / Schwarz / Schwartz | Mazda RX-7 | Preston & Son Enterprises | 214 | | | DNF | 7th | GTU |
| 45th | 76 | Baldwin / Young / Kline | Mazda RX-7 | Malibu Grand Prix | 205 | | | DNF | 8th | GTU |
| 46th | 44 | Redman / Tullius / Haywood | Jaguar XJR-5 | Group 44 | 203 | | | Tyre, fire | 17th | GTP |
| 47th | 57 | Zwiren / Pio Costa / Allison / Donnington | Mazda RX-7 | Zwiren Racing | 188 | | | Fuel system | 9th | GTU |
| 48th | 31 | Gralia / Donaldson / Goral | Porsche 935 | Goral Racing | 183 | | | DNF | 18th | GTP |
| 49th | 51 | McComb / Mancuso / Fiala | Ferrari 512 BB/LM | Mosler Racing | 171 | | | Gearbox | 19th | GTO |
| 50th | 17 | Bacon / Guest / Millen | Mazda RX-7 | Al Bacon Racing | 170 | | | Gearbox | 10th | GTU |
| 51st | 4 | Price / Baird / Hagan / Labonte | Lola T711 Chevrolet | Lee Racing | 160 | | | Gearbox | 19th | GTP |
| 52nd | 29 | Roe / Byrne / Brassfield | March 84G Chevrolet | DeAtley Motorsports | 159 | | | Oil system | 20th | GTP |
| 53rd | 95 | Van Every / Tisdelle / Refenning | Porsche 935 | Van Every Racing | 157 | | | Oil leak | 21st | GTP |
| 54th | 06 | Bauer / Miller / Ribbs | Ford Mustang | Team Roush Protofab | 157 | | | Oil system | 20th | GTO |
| 55th | 04 | Ballot-Léna / Adams / Robinson | Jaguar XJR-5 | Group 44 | 154 | | | Oil pressure | 22nd | GTP |
| 56th | 60 | Swan / Ruth / Dietrich | Mazda RX-7 | Hobbit Racing | 150 | | | Accident | 11th | GTU |
| 57th | 54 | Heinz / Barnett / Thompson | Chevrolet Corvette | Dave Heinz Imports | 138 | | | DNF | 21st | GTO |
| 58th | 66 | Beasley / Lewis / Grantham | Porsche Carrera RSR | Bob Beasley | 118 | | | Accident | 22nd | GTO |
| 59th | 68 | Halsmer / Morton / Quester | Porsche 962 | B.F. Goodrich | 107 | | | Accident | 23rd | GTP |
| 60th | 86 | Boutsen / Leven / Pescarolo | Porsche 962 | Bayside Disposal Racing | 101 | | | Engine | 24th | GTP |
| 61st | 97 | Scyphers / Glick / Cooper | Chevrolet Corvette | Scyphers-Ankor Racing | 99 | | | Accident | 23rd | GTO |
| 62nd | 25 | Miller / Cowart / DeNarvaez | March 83G Chevrolet | Red Lobster Racing | 92 | | | Gearbox | 25th | GTP |
| 63rd | 87 | Forbes-Robinson / Schneider / Istook | Porsche 924 Carrera | Performance Motorsports | 89 | | | Accident | 12th | GTU |
| 64th | 58 | Torres / Kravig / Hammond | Porsche 934 | Coin Operated Racing | 86 | | | DNF | 24th | GTO |
| 65th | 13 | Rubino / Wagoner / Knott | Mazda RX-7 | Rubino Racing | 67 | | | Axle | 13th | GTU |
| 66th | 20 | Baker / Herman / Maher | Porsche 935 JLP-2 | Spirit of Cleveland | 62 | | | Turbocharger | 26th | GTP |
| 67th | 70 | Cummings / Rubright | Chevrolet Corvette | Ormond Racing | 58 | | | Engine | 25th | GTO |
| 68th | 07 | St. James / Coconis / Lang | Argo JM16 Ford | LSJ Racing | 54 | | | Gearbox | 27th | GTP |
| 69th | 08 | Olson / Potter / Howe | Mazda RX-7 | Paul Romano | 45 | | | DNF | 14th | GTU |
| 70th | 77 | Wallace / Petrick / Sikes | Mazda RX-7 | Championship Motorsports | 36 | | | Fire | 15th | GTU |
| 71st | 47 | Bohren / Bouchard | Pontiac Firebird | Dingman Brothers Racing | 35 | | | DNF | 26th | GTO |
| 72nd | 41 | Sereix / Noseda | Pontiac Firebird | Unlimited Telephones | 28 | | | Fuel system | 27th | GTO |
| 73rd | 84 | Clay Young | Pontiac Fiero | Young Racing | 21 | | | Engine | 16th | GTU |
| 74th | 16 | Grohs | Porsche 935 L | Henn's Swap Shop Racing | 15 | | | Engine | 28th | GTP |
| 75th | 61 | Shelton / Courtney / O'Neill | Royale RP40 Ford | Team USA/Deco Sales | 14 | | | Clutch | 29th | GTP |
| 76th | 74 | Gentilozzi | Porsche 924 Carrera GTR | Whitehall Motorsports | 12 | | | Cooling system | 17th | GTU |