PORSCHE RACING HISTORY1978 - Watkins Glen 6 Hours
8 July 1978 - Watkins Glen, USA
Toine Hezemans, John Fitzpatrick & Peter Gregg win in a Porsche 935/77A
Overall - 1st, 2nd : Gr.5 - 1st, 2nd : GT - 2nd, 3rd
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 30 | Porsche 935/77A | 930 890 0011 | Gr.5 | Toine Hezemans (NL)/John Fitzpatrick (GB)/Peter Gregg (USA) | Gelo Racing Team (D) | 1st | 1st | 2nd | 146 laps |
| 90 | Porsche 935/77A | 930 890 0024 | Gr.5 | Rolf Stommelen (D)/Manfred Schurti (FL)/Dick Barbour (USA) | Dick Barbour Performance (USA) | 2nd | 2nd | 1st | 146 laps |
| 13 | Porsche 935 | 930 670 0180 | Gr.5 | Hal Shaw, Jr. (USA)/Monte Shelton (USA) | Hal Shaw Racing (USA) | 4th | 4th | 8th | 136 laps |
| 71 | Porsche 935 | 930 770 0910 | Gr.5 | John Thomas (USA)/Otis Chandler (USA) | Otis Chandler (USA) | 6th | 5th | 15th | 132 laps |
| 3 | Porsche 935 | 930 770 0955 | Gr.5 | Janet Guthrie (USA)/Brian Redman (GB)/Hurley Haywood (USA) | Vasek Polak Racing (USA) | 8th | 6th | 7th | 128 laps |
| 97 | Porsche 911 Carrera RSR | TA 2 | Werner Frank (USA)/Roger Schramm (USA) | Framm Promotions (USA) | 9th | 5th | 28th | 127 laps | |
| 32 | Porsche 911 Carrera RSR | 911 460 9048 | Gr.5 | Steve Griswold (USA)/Bob Akin (USA) | Earle & Akin Racing Assoc. (USA) | 10th | 7th | 27th | 125 laps |
| 77 | Porsche 911 S | TA 1 | Bruce Jennings (USA)/John O'Steen (USA) | Bruce Jennings (USA) | 13th | 2nd | 40th | 122 laps | |
| 7 | Porsche 935 | 930 770 0958 | Gr.5 | Ludwig Heimrath, Sr (CDN)/Paul Miller (USA) | Heimrath Racing (CDN) | 15th | 8th | 12th | 119 laps |
| 79 | Porsche 911 Carrera RSR | Gr.5 | Michael Callas (USA)/Peter Papke (USA) | Rennsport Porsche Works (USA) | 16th | 9th | 29th | 118 laps | |
| 17 | Porsche 934 | 930 670 0162 | GT | Angelo Pallavicini (CH)/Enzo Calderari (CH) | Pallvano Corse (CH) | 18th | 2nd | 33rd | 110 laps |
| 94 | Porsche 935/77A | Gr.5 | Bill Whittington (USA)/Don Whittington (USA) | Whittington Borthers (USA) | 22nd | 10th | 9th | 98 laps - Radiator | |
| 0 | Porsche 935/77A | Gr.5 | Danny Ongais (USA)/Ted Field (USA) | Interscope Racing (USA) | 25th | 11th | 3rd | 95 laps - Transmission | |
| 1 | Porsche 935 | 930 770 0913 | Gr.5 | George Follmer (USA)/Jacky Ickx (B) | Vasek Polak Racing (USA) | 26th | 12th | 4th | 92 laps - Engine |
| 24 | Porsche 911 Carrera RSR | 911 460 9056 | TA 2 | Tom Frank (USA)/Bruce Leven (USA) | Executive Industries (USA) | 28th | 14th | 21st | 85 laps - Accident |
| 22 | Porsche 911 Carrera RSR | TA 2 | Jeffrey Stephens (USA)/Bob Bergstrom (USA) | Jeffrey Stephens (USA) | 30th | 15th | 41st | 76 laps - Electrical | |
| 4 | Porsche 935 | Gr.5 | Hurley Haywood (USA)/John Gunn (USA) | Vasek Polak Racing (USA) | 33rd | 14th | 17th | 72 laps - Oil Leak | |
| 88 | Porsche 911 S | TA 2 | Joseph Hamilton (USA)/Ron Collins (USA)/Chuck Wade (USA) | Hamilton House Racing | 34th | 17th | 36th | 72 laps - Accident | |
| 74 | Porsche 911 S | GT | Bill Scott (USA)/Pierre Honegger (USA)/David Weir (USA) | Z & W Enterprises (USA) | 39th | 3rd | 37th | 18 laps - Accident | |
| 62 | Porsche 911 Carrera RSR | TA 2 | Tuck Thomas (USA)/J. Robert Johnson (USA) | Lancer | 43rd | 20th | 31st | 2 laps - Mechanical |
World Championship for Makes Trans-Am Watkins Glen 6 Hours
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