| | Heat | Dash | B Feature | A Feature |
|---|
|
|---|
| 4/17/1966 | Eldora Speedway - Rossburg, OH 410 Sprints - Non-Winged: USAC National Sprint Cars 305 Sprints - Non-Winged | Results | | Mario Andretti (305 Sprints - Non-Winged) | - | - | - | 8th |
|
| 8/21/1966 | Illinois State Fairgrounds - Springfield, IL Silver Crown: USAC Silver Crown | Results | | Mario Andretti (Silver Crown) | - | - | - | 2nd |
|
| 9/4/1966 | DuQuoin State Fairgrounds - 1 Mile - DU QUOIN, IL Silver Crown: USAC Silver Crown | Results | | Mario Andretti (Silver Crown) | - | - | - | 15th |
|
| 9/4/1966 | Eldora Speedway - Rossburg, OH 410 Sprints - Non-Winged: USAC National Sprint Cars 305 Sprints - Non-Winged | Results | | Mario Andretti (305 Sprints - Non-Winged) | - | - | - | 1st |
|
| 9/10/1966 | Indiana State Fairgrounds - Indianapolis, IN Silver Crown: USAC Silver Crown | Results | | Mario Andretti (Silver Crown) | - | - | - | 1st |
|
| 10/23/1966 | California State Fairgrounds - Sacramento, CA Silver Crown: USAC Silver Crown | Results | | Mario Andretti (Silver Crown) | - | - | - | 10th |
|