1988
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1987
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1986
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| | | IMSA Camel GTP championship | | Position: 1 (210 points) | ? races. ? wins. ? pole positions. ? podiums. ? fastest laps. | | Car: Porsche 962 | | Complete results needed. |
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1985
| | FIA World Endurance Championship | | Position: 42 (8 points) | 2 races. 0 wins. 0 pole positions. 0 podiums. 0 fastest laps.
| | Team: Rothmans Porsche | | Car: Porsche 962C | | Car: Porsche 956 |
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1984
| | PPG Indy Car World Series | | Position: 18 (28 points) | 14 races. 0 wins. 0 pole positions. 0 podiums. 0 fastest laps.
| | Team: Alex Morales Racing | | Car: March 84C (Cosworth) |
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1983
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| | | Can-Am | | Position: 25 (7 points) | 1 race. 0 wins. 0 pole positions. 0 podiums. 0 fastest laps.
| | Team: Holbert Racing | | Car: March 83G (Porsche) |
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| | | European Endurance Championship | | Position: 19 (24 points) | 0 races. 0 wins. 0 pole positions. 0 podiums. 0 fastest laps.
| | Team: Rothmans Porsche | | Car: Porsche 956 |
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1982
| | Budweiser/7-Eleven Can-Am Series | | Position: 2 (500 points) | 8 races. 4 wins. 3 pole positions. 7 podiums. 2 fastest laps.
| | Team: Racing Team VDS | | Car: VDS 001 (Chevrolet) |
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1981
| | SCCA Budweiser Can-Am Challenge | | Position: 3 (420 points) | 10 races. 3 wins. 1 pole position. 4 podiums. 0 fastest laps.
| | Team: CRC Chemicals | | Car: CAC 2 (Chevrolet) |
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| | | IMSA Camel GT Challenge | | Position: 17 (30 points) | ? races. ? wins. ? pole positions. ? podiums. ? fastest laps. | | Complete results needed. |
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1980
| | SCCA Citicorp Can-Am Challenge | | Position: 2 (40 points) | 10 races. 2 wins. 0 pole positions. 6 podiums. 3 fastest laps.
| | Team: Holbert Racing | | Car: CAC 1 (Chevrolet) |
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| | | World Sportscar Championship - GTX | | Position: no position | 1 race. 0 wins. ? pole positions. 1 podium. ? fastest laps. | | Team: Preston Henn | | Car: Porsche 93 | | Complete results needed. |
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| | | World Sportscar Championship | | Position: no position | ? races. ? wins. ? pole positions. ? podiums. ? fastest laps. | | Team: Preston Henn | | Complete results needed. |
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1979
| | SCCA Citicorp Can-Am Challenge | | Position: 7 (9 points) | 8 races. 0 wins. 0 pole positions. 1 podium. 0 fastest laps.
| | Team: Hogan Racing | | Car: Hogan HR001 (Chevrolet) |
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| | | NASCAR Winston Cup | | Position: 45 (402 points) | 6 races. 0 wins. 0 pole positions. 0 podiums. ? fastest laps. | | Car: Oldsmobile | | Car: Chevrolet | | Complete results needed. |
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1978
| | NASCAR Winston Cup | | Position: 34 (1142 points) | 12 races. 0 wins. 0 pole positions. 0 podiums. ? fastest laps. | | Car: Oldsmobile | | Car: Chevrolet | | Complete results needed. |
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| | | SCCA Citicorp Can-Am Challenge | | Position: 3 (1674 points) | 10 races. 1 win. 0 pole positions. 5 podiums. 0 fastest laps.
| | Team: Hogan Racing | | Car: Lola T332 (Chevrolet) | | Car: Lola T333CS (Chevrolet) |
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1977
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1976
| | NASCAR Winston Cup | | Position: 131 | 1 race. 0 wins. 0 pole positions. 0 podiums. ? fastest laps. | | Car: Ford | | Complete results needed. |
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1974
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