| Season |
Races |
Classes & Champions
|
| 1971 |
6 |
GTO - Dave Heinz
GTU - Peter Gregg
|
| 1972 |
10 |
GTO - Phil Currin
GTU - Hurley Haywood
|
| 1973 |
10 |
GTO - Peter Gregg
GTU - Bob Bergstrom
|
| 1974 |
12 |
GTO - Peter Gregg
GTU - Walter Maas
|
| 1975 |
17 |
GTO - Peter Gregg
GTU - Bob Sharp
|
| 1976 |
15 |
GTO - Al Holbert
GTU - Brad Frisselle
|
| 1977 |
18 |
GTO - Al Holbert
GTU - Walter Maas
|
| 1978 |
21 |
GTO - Dave Cowart
GTU - Dave White
GTX - Peter Gregg
|
| 1979 |
22 |
GTO - Howard Meister
GTU - Don Devendorf
GTX - Peter Gregg
|
| 1980 |
21 |
GTO - Luis Mendez
GTU - Walt Bohren
GTX - John Fitzpatrick
|
| 1981 |
22 |
GTO - Dave Cowart
GTU - Lee Mueller
GTX - Brian Redman
|
| 1982 |
25 |
GTO - Don Devendorf
GTU - Jim Downing
GTP - John Paul, Jr.
|
| 1983 |
20 |
GTO - Wayne Baker
GTU - Roger Mandeville
GTP - Al Holbert
|
| 1984 |
25 |
GTO - Roger Mandeville
GTU - Jack Baldwin
GTP - Randy Lanier
|
| 1985 |
27 |
GTO - John Jones
GTU - Jack Baldwin
Lights - Jim Downing
GTP - Al Holbert
|
| 1986 |
32 |
GTO - Scott Pruett
GTU - Tommy Kendall
Lights - Jim Downing
GTP - Al Holbert
|
| 1987 |
32 |
GTO - Chris Cord
GTU - Tommy Kendall
Lights - Jim Downing
GTP - Chip Robinson
|
| 1988 |
26 |
GTO - Scott Pruett
GTU - Tommy Kendall
Lights - Tom Hessert, Jr.
GTP - Geoff Brabham
|
| 1989 |
27 |
GTO - Pete Halsmer
GTU - Bob Leitzinger
Lights - Scott Schubot
GTP - Geoff Brabham
|
| 1990 |
27 |
GTO - Dorsey Schroeder
GTU - Lance Stewart
Lights - Tomas Lopez
GTP - Geoff Brabham
|
| 1991 |
28 |
GTO - Pete Halsmer
GTU - John Fergus
Lights - Parker Johnstone
GTP - Geoff Brabham
|
| 1992 |
22 |
GTO - Irv Hoerr
GTS - Steve Millen
GTU - David Loring
Lights - Parker Johnstone
GTP - Juan Manuel Fangio, II
|
| 1993 |
16 |
GTO - Charles Morgan
GTS - Tommy Kendall
GTU - Jim Pace
Lights - Parker Johnstone
GTP - Juan Manuel Fangio, II
|
| 1994 |
15 |
GTO - Joe Pezza
WSC - Wayne Taylor
GTS - Steve Millen
GTU - Jim Pace
|
| 1995 |
15 |
GTS-2 - Jorge Trejos
WSC - Fermin Velez
GTS-1 - Irv Hoerr
|
| 1996 |
14 |
GTS-2 - Larry Schumacher
WSC - Wayne Taylor
GTS-1 - Irv Hoerr
|
| 1997 |
19 |
GTS-2 - Larry Schumacher
WSC - Butch Leitzinger
GTS-1 - Andy Pilgrim
GTS-3 - Bill Auberlen
|
| 1998 |
9 |
WSC - Butch Leitzinger
GT3 - Mark Simo
GT2 - Larry Schumacher
GT1 - David Brabham; Andy Wallace
|
