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1973 Calendar
- Road Atlanta
U.S.A.
Round 1- 1st
Peter Gregg - 2ndAl Holbert
- 3rdMarshall Robbins
- Lime Rock Park
U.S.A.
Round 2- 1stMilt Minter
- 2ndPeter GreggSam Posey
- 3rdAl Holbert
- Watkins Glen International
U.S.A.
Round 3- 1stSteve BradleyMaurice Carter
- 2ndPeter Gregg
- 3rdJohn GreenwoodBob Johnson
- Sanair Super Speedway
Canada
Round 4- 1stWarren Agor
- 2ndPaul Nichter
- 3rdMarshall RobbinsJerry Thompson
- Road America
U.S.A.
Round 5- 1stJohn Greenwood
- 2ndWarren Agor
- 3rdAl Holbert
- Grand Prix Edmonton
Canada
Round 6- 1stJohn Greenwood
- 2ndPeter Gregg
- 3rdMarshall RobbinsJerry Thompson