Len Duncan
Leonard Duncan
Birthplace: New York, New York
Born: July 25, 1911
Died: August 1, 1998
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| Track | Starts | DNS/DNQ | Wins | 2nds | 3rds | 4ths | 5ths | Best Finish | Poles |
| Darlington | Relief | drove | only | ||||||
| Indianapolis | 1 | 3 | 0 | 0 | 0 | 0 | 0 | 31 | 0 |
| Langhorne | 0 | 1 | 0 | 0 | 0 | 0 | 0 | NS | 0 |
| Milwaukee | 0 | 1 | 0 | 0 | 0 | 0 | 0 | NS | 0 |
| Syracuse | 0 | 1 | 0 | 0 | 0 | 0 | 0 | NS | 0 |
| Trenton | 3 | 0 | 0 | 0 | 0 | 0 | 0 | 7 | 0 |
| Williams Grove | 2 | 0 | 0 | 0 | 0 | 0 | 0 | ?? | 0 |
| Chassis | Starts | DNS/DNQ | Wins | 2nds | 3rds | 4ths | 5ths | Best Finish | Poles |
| Kurtis | 0 | 5 | 0 | 0 | 0 | 0 | 0 | NS | 0 |
| Lesovsky | 2 | 0 | 0 | 0 | 0 | 0 | 0 | 7 | 0 |
| Pawl | Relief | drove | only | ||||||
| Russo/Nichels | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 15 | 0 |
| Schroeder | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 31 | 0 |
| Trevis | 0 | 1 | 0 | 0 | 0 | 0 | 0 | NS | 0 |
| Unknown | 2 | 0 | 0 | 0 | 0 | 0 | 0 | ?? | 0 |
| Engine | Starts | DNS/DNQ | Wins | 2nds | 3rds | 4ths | 5ths | Best Finish | Poles |
| Offy | 4 | 6 | 0 | 0 | 0 | 0 | 0 | 7 | 0 |
| Unknown | 2 | 0 | 0 | 0 | 0 | 0 | 0 | ?? | 0 |