1996
24 Hours of Le Mans - LMP1
3rd
1995
Le Mans 24 Hours - Class WSC
1st
1985
USAC Gold Crown Championship
2nd
1984
CART - Indy Car World Series
1st
1983
CART - Indy Car World Series
3rd
1983
Le Mans 24h - C class
3rd
1982
CART - Indy Car World Series
3rd
1979
IROC International Race Of Champions
1st
1979
13° Race of Champions - Brands Hatch - Formula 1
3rd
1978
World Championship of F1 Drivers - Formula One
1st
1978
IROC International Race Of Champions
2nd
1977
World Championship of Drivers - Formula One
3rd
1976
IROC International Race Of Champions
2nd
1975
27° BRDC International Trophy - Silverstone - Formula 1
3rd
1975
SCCA/USAC Formula 5000 Championship
2nd
1975
6 Hours of Watkins Glen - World Sports Car
2nd
1974
SCCA/USAC Formula 5000 Championship
2nd
1974
USAC National Silver Crown Series
1st
1974
1000 Km of Monza - World Sports Car
1st
1973
USAC National Silver Crown Series
2nd
1972
12 Hours of Sebring - World Sports Car
1st
1972
6 Hours of Watkins Glen - World Sports Car
1st
1972
6 Hours of Daytona - World Sports Car
1st
1972
1000 km of Brands Hatch - World Sports Car
1st
1971
Questor Grand Prix - Ontario - F1 & F5000
1st
1969
USAC National Championship - Indy Car
1st
1968
USAC National Championship - Indy Car
2nd
1967
USAC National Championship - Indy Car
2nd
1966
USAC National Championship - Indy Car
1st
1966
USAC National Sprint Car Series
2nd
1965
USAC National Championship - Indy Car
1st
1964
USAC National Sprint Car Series
3rd