Len Duncan
Leonard Duncan
Birthplace: New York, New York
Born: July 25, 1911
Died: August 1, 1998
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| Year | Series | Starts | DNS/DNQ | Wins | 2nds | 3rds | 4ths | 5ths | Best Finish | Poles | Points | Standing |
| 1946 | AAA | 2 | 0 | 0 | 0 | 0 | 0 | 0 | ?? | 0 | 10+ | ?? |
| 1953 | AAA | 0 | 2 | 0 | 0 | 0 | 0 | 0 | NS | 0 | 0 | NR |
| 1954 | AAA | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 31 | 0 | 47 | 42 |
| 1955 | AAA | 0 | 3 | 0 | 0 | 0 | 0 | 0 | NS | 0 | 17.1 | 52 |
| 1956 | USAC | 0 | 1 | 0 | 0 | 0 | 0 | 0 | NS | 0 | 0 | NR |
| 1959 | USAC | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 12 | 0 | 10 | 49T |
| 1960 | USAC | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 15 | 0 | 0 | NR |
| 1961 | USAC | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 7 | 0 | 60 | 29T |
| Total | 6 | 6 | 0 | 0 | 0 | 0 | 0 | 7 | 0 | 144.1 |
+Total number of starts and points scored in 1946 not yet fully determined
| Track Type | Starts | DNS/DNQ | Wins | 2nds | 3rds | 4ths | 5ths | Best Finish | Poles |
| Dirt Oval | 2 | 2 | 0 | 0 | 0 | 0 | 0 | ?? | 0 |
| Paved Oval | 4 | 4 | 0 | 0 | 0 | 0 | 0 | 7 | 0 |
| Series | Starts | DNS/DNQ | Wins | 2nds | 3rds | 4ths | 5ths | Best Finish | Poles |
| AAA | 3 | 5 | 0 | 0 | 0 | 0 | 0 | 31 | 0 |
| USAC | 3 | 1 | 0 | 0 | 0 | 0 | 0 | 7 | 0 |
| Start # | Date | Track | Type | Series | Car # | Sponsor/Name | Chassis | Engine | Start | Finish | Laps | Status |
Points |
| 1 | 4/14/1946 | Williams Grove 1 | DO | AAA | X | X | X | X | X | X | X | Entered, may not have transferred to feature |
4 |
| 2 | 4/28/1946 | Williams Grove 2 | DO | AAA | X | X | X | X | X | X | X | Entered, may not have transferred to feature |
6 |
| -- | 5/30/1953 | Indianapolis | PO | AAA | 31 | Caccia Motors | Schroeder D | Offy | -- | -- | -- | DNS, too slow | |
| --/ | 5/30/1953 | Indianapolis | PO | AAA | 81 | Central Excavating | Trevis D | Offy | -- | -- | -- | Did not qualify | |
| -- | 9/12/1953 | Syracuse | DO | AAA | 33 | Ray Brady | Kurtis 4000 | Offy | -- | -- | -- | DNS, too slow | |
| 3 | 5/31/1954 | Indianapolis | PO | AAA | 33 | Ray Brady | Schroeder | Offy | 26 | 31 | 101 | Broken brake cylinder | |
| RD | 7/5/1954 | Darlington | PO | AAA | 1 | Bardahl | Kurtis 4000 | Offy | -- | -- | 70 | Relieved Hanks 77-146 | 47 |
| -- | 5/30/1955 | Indianapolis | PO | AAA | 24 | Ray Brady | Kurtis 4000D | Offy | -- | -- | -- | DNS, too slow | |
| --/ | 5/30/1955 | Indianapolis | PO | AAA | 73 | McNamara | Kurtis 500C | Offy | -- | -- | -- | Wrecked practice | |
| -- | 6/5/1955 | Milwaukee 1 | PO | AAA | 24 | Ray Brady | Kurtis 4000D | Offy | -- | -- | -- | DNS, too slow, S11 | |
| RD | 6/19/1955 | Langhorne | DO | AAA | 37 | Dr. Sabourin | Pawl | Offy | -- | -- | 54 | Relieved D. Carter 43-97 | 17.1 |
| --/ | 6/19/1955 | Langhorne | DO | AAA | 24 | Ray Brady | Kurtis 4000 | Offy | -- | -- | -- | DNS, too slow | |
| -- | 5/30/1956 | Indianapolis | PO | USAC | 51 | Ray Brady | Kurtis 4000D | Offy | -- | -- | -- | Did not qualify | |
| 4 | 9/27/1959 | Trenton 2 | PO | USAC | 78 | Stearly Motor Freight | Lesovsky D | Offy | 15 | 12 | 97 | Flagged | 10 |
| 5 | 4/10/1960 | Trenton 1 | PO | USAC | 33 | Harden | Russo/Nichels D | Offy | 14 | 15 | 91 | Flagged | |
| 6 | 4/9/1961 | Trenton 1 | PO | USAC | 42 | Stearly Motor Freight | Lesovsky D | Offy | 14 | 7 | 98 | Flagged | 60 |