ARCA Menards Series 2021: Race 17/20
| Race | Southern Illinois 100 |
| Date | Sunday, Sept. 5, 2021 |
| Track | DuQuoin State Fairgrounds |
| Layout | One-mile dirt track |
| Location | DuQuoin, Illinois |
| Start time | 8 p.m. CT / 9 p.m. ET |
| Laps | 100 |
| Miles | 100 |
| Tickets | TBD |
| TV channel | MAVTV |
| Live stream | TrackPass |
| Radio | TBD |
| Race day schedule | Sunday, Sept. 5: Garage opens at 11 a.m.; Practice at 4:15 p.m.; Qualifying at 6 p.m.; Race at 8 p.m. (All times CT) |
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