1990
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1986
| | Can-Am | | Position: 1 (64 points) | 4 races. 1 win. 2 pole positions. 3 podiums. 2 fastest laps.
| | Team: Horst Kroll Racing | | Car: Frissbee KR3 (Chevrolet) |
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1985
| | SCCA Can-Am Challenge | | Position: 2 (76 points) | 6 races. 1 win. 1 pole position. 3 podiums. 1 fastest lap.
| | Team: Horst Kroll Racing | | Car: Frissbee KR3 (Chevrolet) |
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1984
| | Can-Am | | Position: 3 (119 points) | 10 races. 0 wins. 0 pole positions. 4 podiums. 0 fastest laps.
| | Team: Horst Kroll Racing | | Car: Frissbee KR3 (Chevrolet) |
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1983
| | Can-Am | | Position: 5 (55 points) | 6 races. 0 wins. 0 pole positions. 0 podiums. 0 fastest laps.
| | Team: Horst Kroll Racing | | Car: Frissbee GR3 (Chevrolet) |
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1982
| | Budweiser/7-Eleven Can-Am Series | | Position: 13 (36 points) | 8 races. 0 wins. 0 pole positions. 0 podiums. 0 fastest laps.
| | Team: Horst Kroll Racing | | Car: Lola T300 (Chevrolet) | | Car: Lola T332 (Chevrolet) |
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1981
| | SCCA Budweiser Can-Am Challenge | | Position: 16 (34 points) | 6 races. 0 wins. 0 pole positions. 0 podiums. 0 fastest laps.
| | Team: Horst Kroll Racing | | Car: Lola T332 (Chevrolet) | | Car: Lola T330 (Chevrolet) | | Car: Lola T300 (Chevrolet) |
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1980
| | SCCA Citicorp Can-Am Challenge | | Position: 14 (2 points) | 6 races. 0 wins. 0 pole positions. 0 podiums. 0 fastest laps.
| | Team: Horst Kroll Racing | | Car: Lola T332 (Chevrolet) |
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1979
| | SCCA Citicorp Can-Am Challenge | | Position: 17 (3 points) | 8 races. 0 wins. 0 pole positions. 0 podiums. 0 fastest laps.
| | Team: Horst Kroll Racing | | Car: Lola T332 (Chevrolet) |
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1978
| | SCCA Citicorp Can-Am Challenge | | Position: 19 (112.5 points) | 8 races. 0 wins. 0 pole positions. 0 podiums. 0 fastest laps.
| | Team: Horst Kroll Racing | | Car: Lola T300 (Chevrolet) | | Car: Lola T332 (Chevrolet) |
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1977
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1976
| | Formula 5000 USAC-SCCA | | Position: 12 (11 points) | 6 races. 0 wins. 0 pole positions. 0 podiums. 0 fastest laps.
| | Team: Horst Kroll Racing | | Car: Lola T300 (Chevrolet) |
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1975
| | Formula 5000 USAC-SCCA | | Position: no position | 6 races. 0 wins. 0 pole positions. 0 podiums. 0 fastest laps.
| | Team: Horst Kroll | | Car: March 73A/741 (Chevrolet) |
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1974
| | Formula 5000 USAC-SCCA | | Position: 15 (10 points) | 5 races. 0 wins. 0 pole positions. 0 podiums. 0 fastest laps.
| | Team: Horst Kroll Racing | | Car: Lola T300 (Chevrolet) |
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1973
| | L&M F5000 Championship | | Position: 30 (1 points) | 5 races. 0 wins. 0 pole positions. 0 podiums. 0 fastest laps.
| | Team: Horst Kroll Racing | | Car: Lola T300 HU15 (Chevrolet V8) |
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1972
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1971
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1970
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| | | Canadian Road Racing Championship | | Position: 2 (126 points) | 6 races. 1 win. 0 pole positions. 5 podiums. ? fastest laps. | | Team: Altona Racing | | Car: Lola T142 (Chevrolet V8) | | Complete results needed. |
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1969
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| | | Canadian Road Racing Championship | | Position: 2 (38 points) | 9 races. 0 wins. 3 pole positions. 6 podiums. ? fastest laps. | | Team: Altona Motors | | Car: Lola T142 (Chevrolet V8) | | Complete results needed. |
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| | | Formula 5000 Great Britain | | Position: 26 (215 points) | 2 races. 0 wins. 0 pole positions. 0 podiums. 0 fastest laps.
| | Team: Altona Racing Partnership | | Car: Lola T142 (Chevrolet) |
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1967
| | Doug Revson Trophy | | Position: no position | 1 race. 0 wins. ? pole positions. 0 podiums. ? fastest laps. | | Car: Kelly Porsche | | Complete results needed. |
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1966
| | Canadian-American Challenge Cup | | Position: no position | 0 races. 0 wins. 0 pole positions. 0 podiums. 0 fastest laps.
| | Team: VW Yonge Ltd | | Car: Porsche 906 (Porsche) |
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