PORSCHE RACING HISTORYSteve Southard (USA)
1978
18 March 1978 - Sebring 12 Hours - World Challenge for Endurance Drivers
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 00 | Porsche 914/6 | GTU | Steve Southard (USA)/Jim Trueman (USA) | Red Roof Inns (USA) | 29th | 13th | 63rd | 164 laps - Mechanical |
27 August 1978 - Mid Ohio 250 Miles - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 40 | Porsche 914/6 | GTU | Steve Southard (USA) | 34th | 11th | 36th | 61 laps - DNF |
26 November 1978 - Daytona Finale 250 Miles - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 40 | Porsche 914/6 | GTU | Steve Southard (USA)/William Koch (USA) | Performance Specialists | 59th | 14th | 75th | 7 laps - DNF |