PORSCHE RACING HISTORY1978 - Trans-Am Laguna Seca
8 October 1978 - Laguna Seca Raceway, USA
Ludwig Heimrath, Sr third in a Porsche 935, 1 lap behind the winning Chevrolet Corvette C3 driven by Greg Pickett
Overall - 3rd : TA-II - 3rd
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 7 | Porsche 935 | 930 770 0958 | TA-II | Ludwig Heimrath, Sr (CDN) | Heimrath Racing (CDN) | 3rd | 3rd | 5th | 51 laps |
| 85 | Porsche 934/5 | 930 770 0952 | TA-II | Bruce Leven (USA) | Bayside Disposal Racing (USA) | 6th | 6th | 11th | 49 laps |
| 16 | Porsche 914/6 | TA-II | Darrel Overstreet (USA) | Oversteering Racing (USA) | 25th | 9th | 39th | 44 laps | |
| 61 | Porsche 911 S | TA-II | Gary Nylander (USA) | Bear Gulch Racing | 27th | 10th | 30th | 42 laps | |
| 26 | Porsche 911 | TA-II | Tom Masterson (USA) | Swag Engineering (USA) | 29th | 11th | 36th | 35 laps | |
| 57 | Porsche 935 | 930 770 0951 | TA-II | Monte Shelton (USA) | Porsche+Audi Northwest (USA) | 30th | 12th | 2nd | 34 laps - Engine |
| 23 | Porsche 914/6 | 473 29 24107 | TA-I | Bob Zulkowski (USA) | Metal Craft Racing (USA) | 31st | 19th | 24th | 33 laps - Turbo Failure |
| 13 | Porsche 935 | 930 670 0180 | TA-II | Hal Shaw, Jr. (USA) | Hal Shaw Racing (USA) | 32nd | 13th | 7th | 30 laps |
| 21 | Porsche 934/5 | 930 770 0954 | TA-II | Bruce Canepa (USA) | Canepa Racing (USA) | DNS | 8th |
Trans-Am
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