G.C. Spencer at Islip Speedway
G.C. Spencer has made 4 NASCAR Cup Series starts at Islip Speedway since 1965, with 0 wins, 2 top-10s and an average finish of 10.2.
Totals at Islip Speedway by series
| Series | Starts | Wins | Top 5 | Top 10 | Laps led | Avg finish | Avg start | Best finish |
|---|---|---|---|---|---|---|---|---|
| Cup Series | 4 | 0 | 2 | 2 | 0 | 10.2 | 7.2 | 3 |
Every start at Islip Speedway
| Date | Race | Series | Start | Finish | Laps led | Status |
|---|---|---|---|---|---|---|
| July 15, 1971 | 1971 Islip 250 | Winston Cup Series | 14 | 5 | 0 | Running |
| July 7, 1968 | 1968 Islip 300 | Grand National Series | 7 | 20 | 0 | Rear end |
| July 15, 1967 | 1967 Islip 300 | Grand National Series | 5 | 3 | 0 | Running |
| July 14, 1965 | 1965 Islip Speedway, July 14 | Grand National Series | 3 | 13 | 0 | Differential |