| | 1966 | Enduro Grand Nationals |
| | Indianapolis Raceway Park | Clermont, IN |
| Finish | Driver | Hometown | Kart | Engine |
| | A Modified Heavy |
| 1 | | Jim Walter | Lorain, OH | Dart | Mc |
| | A Modified Jr. |
| 1 | | Rick Spoonts | Houston, TX | Hornet | Mc |
| | A Modified Light |
| 1 | | Jim Walter | Lorain, OH | Dart | Mc90 |
| | A Stock Heavy |
| 1 | | Troy Ruttman, Jr. | Dearborn Heights, MI | Caretta | Saetta |
| | A Stock Jr. |
| 1 | | Jeff Brown | Dearborn, MI | Caretta | Saetta |
| | A Stock Light |
| 1 | | Gene Renegar | Dallas, TX | Hornet | Komet |
| | B Limited |
| 1 | | Emerson Dismore | Greenfield, IN | Dart | Mc100 |
| | B Open |
| 1 | | Mickey Rupp | Mansfield, OH | Dart | Mc |
| | B Stock |
| 1 | | Bob Faller | Woodland Hills, CA | Dart | Komet |
| | C Open |
| 1 | | Pete Berlt | Huntington, WV | Dart | Mc |
| | FKE I |
| 1 | | Gene Gross | Fond du Lac, WI | Special | West Bend |
| | FKE II |
| 1 | | Don Surwall | Des Plaines, IL | Special | Mc |