PORSCHE RACING HISTORYJohn O'Steen (USA)
1983 : Sebring 12 Hours - 2nd overall, 1st in class : Lime Rock 3 Hours - 2nd overall : Mid-Ohio 6 Hours - 2nd overall : Daytona 250 Miles Paul Revere - 3rd overall : Pocono 500 Miles - 3rd in class : Daytona Finale 3 Hours - 2nd overall
6 February 1983 - Daytona 24 Hours - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 5 | Porsche 935 K3/80 | 000 00013 | GTP | Bob Akin (USA)/John O'Steen (USA) | Bob Akin Motor Racing (USA) | 73rd | 16th | 4th | 43 laps - Accident |
19 March 1983 - Sebring 12 Hours - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 5 | Porsche 935 K3/80 | 000 00013 | GTP | Bob Akin (USA)/Dale Whittington (USA)/John O'Steen (USA) | Bob Akin Motor Racing (USA) | 2nd | 1st | 6th | 231 laps |
15 May 1983 - Charlotte 500 km - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 5 | Porsche 935 K3/80 | 000 00013 | GTP | Bob Akin (USA)/John O'Steen (USA) | Bob Akin Motor Racing (USA) | 27th | 7th | 7th | 92 laps |
30 May 1983 - Lime Rock 3 Hours - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 5 | Porsche 935 K3/80 | 000 00013 | GTP | Bob Akin (USA)/John O'Steen (USA) | Bob Akin Motor Racing (USA) | 2nd | 2nd | 5th | 173 laps |
19 June 1983 - Mid-Ohio 6 Hours - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 5 | Porsche 935 K3/80 | 000 00013 | GTP | Bob Akin (USA)/John O'Steen (USA) | Bob Akin Motor Racing (USA) | 2nd | 2nd | 5th | 201 laps |
3 July 1983 - Daytona 250 Miles Paul Revere - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 5 | Porsche 935 K3/80 | 000 00013 | GTP | Bob Akin (USA)/John O'Steen (USA) | Bob Akin Motor Racing (USA) | 3rd | 3rd | 6th | 64 laps |
14 August 1983 - Mosport 6 Hours - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 5 | Porsche 935 K3/80 | 000 00013 | GTP | Bob Akin (USA)/John O'Steen (USA)/Dennis Aase (USA) | Bob Akin Motor Racing (USA) | 12th | 6th | 5th | 191 laps |
11 September 1983 - Pocono 500 Miles - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 5 | Porsche 935 K3/80 | 000 00013 | GTP | Bob Akin (USA)/John O'Steen (USA) | Bob Akin Motor Racing (USA) | 4th | 3rd | 8th | 171 laps |
27 November 1983 - Daytona Finale 3 Hours - IMSA - International Motor Sport Association
| No. | Car | # | Class | Drivers | Entrant | Pos | Class | Grid | Notes |
| 5 | Porsche 935/84 | 935/84 | GTP | Bob Akin (USA)/John O'Steen (USA) | Bob Akin Motor Racing (USA) | 2nd | 2nd | 3rd | 91 laps |