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| 4/17/2021 | Park Jefferson International Speedway - Jefferson, SD Lucas Oil ASCS and RACESaver Sioux City Sprint Nationals plus IMCA Modifieds& Stock Cars 360 Sprints - Winged: ASCS National IMCA Modified, IMCA Stock Car, IMCA RaceSaver Sprint Car | Results | | Jim Thies (IMCA Modified) | 1st | - | - | 5th |
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| 4/18/2021 | Interstate Speedway (SD) - Jefferson, SD IMCA Frostbuster IMCA Modified, IMCA Northern SportMod, IMCA Stock Car, IMCA Hobby Stock, IMCA Sport Compact | Results | | Jim Thies (IMCA Modified) | 7th | - | - | 5th |
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| 4/25/2021 | Interstate Speedway (SD) - Jefferson, SD IMCA Weekly Racing IMCA Modified, IMCA Northern SportMod, IMCA Stock Car, IMCA Hobby Stock, IMCA Sport Compact | Results | | Jim Thies (IMCA Modified) | 7th | - | - | 11th |
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| 4/30/2021 | Crawford County Speedway - Denison, IA Regular Night All Classes-$1000 to win Sprint Cars 305 Sprints - Winged, Hobby Stocks, Stock Cars, A Modifieds, B Modifieds, Hornets, Sport Compact | Results | | Jim Thies (A Modifieds) | 1st | - | - | 4th |
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| 5/1/2021 | Shelby County Speedway - Harlan, IA May Day Mayhem Hobby Stocks, Stock Cars, A Modifieds, B Modifieds, Dirt Late Models, Sport Compact | Results | | Jim Thies (A Modifieds) | 6th | - | - | 5th |
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| 5/2/2021 | Interstate Speedway (SD) - Jefferson, SD IMCA Weekly Racing IMCA Modified, IMCA Northern SportMod, IMCA Stock Car, IMCA Hobby Stock, IMCA Sport Compact | Results | | Jim Thies (IMCA Modified) | 2nd | - | - | 2nd |
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| 5/7/2021 | Crawford County Speedway - Denison, IA Regular Night All Classes-$1000 to win Modified 305 Sprints - Winged, Hobby Stocks, Stock Cars, A Modifieds, B Modifieds, Hornets, Sport Compact | Results | | Jim Thies (A Modifieds) | 2nd | - | - | 3rd |
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| 5/9/2021 | Interstate Speedway (SD) - Jefferson, SD IMCA Weekly Series IMCA Modified, IMCA Northern SportMod, IMCA Stock Car, IMCA Hobby Stock, IMCA Sport Compact | Results | | Jim Thies (IMCA Modified) | 1st | - | - | 7th (DNF) |
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| 5/15/2021 | Shelby County Speedway - Harlan, IA Pizza Ranch presents The James Buwalda Memorial w/ Kids Candy Dash Hobby Stocks, Stock Cars, A Modifieds, B Modifieds, Vintage Full Body Stock Cars, Sport Compact | Results | | Jim Thies (A Modifieds) | 1st | - | - | 5th |
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| 5/16/2021 | Interstate Speedway (SD) - Jefferson, SD IMCA Weekly Series Dirt Late Models: Tri-State Late Models IMCA Modified, IMCA Northern SportMod, IMCA Stock Car, IMCA Hobby Stock, IMCA Sport Compact | Results | | Jim Thies (IMCA Modified) | 4th | - | - | 13th |
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| 5/21/2021 | Crawford County Speedway - Denison, IA Regular Night All Classes-$1000 to win Sport Mods and Stocks Cars with draw/redraw for these classes 305 Sprints - Winged, Hobby Stocks, Stock Cars, A Modifieds, B Modifieds, Hornets, Sport Compact | Results | | Jim Thies (A Modifieds) | 2nd | - | - | 5th |
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| 5/22/2021 | Shelby County Speedway - Harlan, IA Coca-Cola night Hobby Stocks, Stock Cars, A Modifieds, B Modifieds, Dirt Late Models, Sport Compact | Results | | Jim Thies (A Modifieds) | 5th | - | - | 9th (DNF) |
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| 5/28/2021 | Crawford County Speedway - Denison, IA Regular Night All Classes-$600 to win Hobby Stock and $400 to win Sport Compact 305 Sprints - Winged, Hobby Stocks, Stock Cars, A Modifieds, B Modifieds, Hornets, Sport Compact | Results | | Jim Thies (A Modifieds) | 4th | - | - | 4th |
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| 5/29/2021 | Park Jefferson International Speedway - Jefferson, SD 410 Sprint Cars featuring NOSA plus IMCA 410 Sprints - Winged: Northern Outlaw Sprint Association B Modifieds, IMCA Modified, IMCA Northern SportMod, IMCA Stock Car | Results | | Jim Thies (IMCA Modified) | 6th (DNF) | - | - | 4th |
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| 5/30/2021 | Interstate Speedway (SD) - Jefferson, SD IMCA Weekly Series IMCA Modified, IMCA Northern SportMod, IMCA Stock Car, IMCA Hobby Stock, IMCA Sport Compact | Results | | Jim Thies (IMCA Modified) | 2nd | - | - | 3rd |
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| 5/31/2021 | Park Jefferson International Speedway - Jefferson, SD Memorial Day Duels $1,000 to win IMCA Modifieds/Stock Cars/RACESavers plus IMCA Sport Mods & Hobbies B Modifieds, Street Stocks, IMCA Modified, IMCA Northern SportMod, IMCA Stock Car, IMCA Hobby Stock | Results | | Jim Thies (IMCA Modified) | 4th | - | - | 2nd |
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| 6/4/2021 | Crawford County Speedway - Denison, IA Regular Night All Classes-$1000 to win Modifieds 305 Sprints - Winged, Hobby Stocks, Stock Cars, A Modifieds, B Modifieds, Hornets, Sport Compact | Results | | Jim Thies (A Modifieds) | 5th | - | - | 7th |
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| 6/5/2021 | Shelby County Speedway - Harlan, IA Race for Cancer Awareness Hobby Stocks, Stock Cars, A Modifieds, B Modifieds, Dirt Late Models, Sport Compact | Results | | Jim Thies (A Modifieds) | 5th | - | - | 3rd |
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| 6/6/2021 | Interstate Speedway (SD) - Jefferson, SD IMCA Weekly Series B Modifieds, IMCA Modified, IMCA Northern SportMod, IMCA Stock Car, IMCA Hobby Stock, IMCA Sport Compact | Results | | Jim Thies (IMCA Modified) | 5th (DNF) | - | - | 1st |
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| 6/11/2021 | Crawford County Speedway - Denison, IA Regular Night All Classes-$1000 to win Modified and Sprint Cars. Sponsored by Finishline 305 Sprints - Winged, Hobby Stocks, Stock Cars, A Modifieds, B Modifieds, Hornets, Sport Compact | Results | | Jim Thies (A Modifieds) | 6th | - | - | 14th |
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| 6/13/2021 | Interstate Speedway (SD) - Jefferson, SD IMCA Weekly Series IMCA Modified, IMCA Northern SportMod, IMCA Stock Car, IMCA Hobby Stock, IMCA Sport Compact | Results | | Jim Thies (IMCA Modified) | 5th | - | - | 4th |
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| 6/18/2021 | Crawford County Speedway - Denison, IA Regular Night All Classes-$1000 to win Stock Cars 305 Sprints - Winged, Hobby Stocks, Stock Cars, A Modifieds, B Modifieds, Hornets, Sport Compact | Results | | Jim Thies (A Modifieds) | 2nd | - | - | 1st |
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| 6/19/2021 | Shelby County Speedway - Harlan, IA The BuckSnort presents Father's Day Fleet Hobby Stocks, Stock Cars, A Modifieds, B Modifieds, Dirt Late Models, Vintage Full Body Stock Cars, Sport Compact | Results | | Jim Thies (A Modifieds) | 9th (DNF) | - | - | 8th (DNF) |
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| 6/20/2021 | Interstate Speedway (SD) - Jefferson, SD IMCA Weekly Series IMCA Modified, IMCA Northern SportMod, IMCA Stock Car, IMCA Hobby Stock, IMCA Sport Compact | Results | | Jim Thies (IMCA Modified) | 1st | - | - | 5th |
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| 6/25/2021 | Crawford County Speedway - Denison, IA $1,500 to win at Crawford County Speedway 305 Sprints - Winged, Dirt Super Late Models, Hobby Stocks, Stock Cars, A Modifieds, B Modifieds, Hornets | Results | | Jim Thies (A Modifieds) | 3rd | - | - | 1st |
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| 6/27/2021 | Interstate Speedway (SD) - Jefferson, SD IMCA Weekly Series IMCA Modified: Midwest Madness Tour IMCA Northern SportMod, IMCA Stock Car, IMCA Hobby Stock, IMCA Sport Compact | Results | | Jim Thies (IMCA Modified) | 2nd | - | - | 21st (DNF) |
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| 6/28/2021 | Park Jefferson International Speedway - Jefferson, SD Midwest Madness Tour at Park Jefferson IMCA Modified: Midwest Madness Tour IMCA Northern SportMod, IMCA Stock Car, IMCA Hobby Stock, IMCA Sport Compact | Rain Out |
| 7/2/2021 | Crawford County Speedway - Denison, IA Regular Night All Classes-$600 to win Hobby Stock and $400 to win Sport Compact 305 Sprints - Winged, Hobby Stocks, Stock Cars, A Modifieds, B Modifieds, Hornets | Results | | Jim Thies (A Modifieds) | 3rd | - | - | 6th |
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| 7/4/2021 | Interstate Speedway (SD) - Jefferson, SD 4th of July Racing IMCA Modified, IMCA Northern SportMod, IMCA Stock Car, IMCA Hobby Stock, IMCA Sport Compact | Results | | Jim Thies (IMCA Modified) | 5th | - | - | 11th (DNF) |
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| 7/9/2021 | Crawford County Speedway - Denison, IA Regular Night All Classes-$1000 to win Stock Cars 305 Sprints - Winged, Hobby Stocks, Stock Cars, A Modifieds, B Modifieds, Hornets | Results | | Jim Thies (A Modifieds) | 3rd | - | - | 3rd |
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| 7/11/2021 | Worthington Speedway - Worthington, MN SUNDAY NIGHT RACES Hobby Stocks, Stock Cars, Sportsmans, A Modifieds, B Modifieds, Sport Compact | Results | | Jim Thies (A Modifieds) | 3rd | - | - | 4th |
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| 7/13/2021 | Shelby County Speedway - Harlan, IA Dale Swanson Memorial Hobby Stocks, Stock Cars, A Modifieds, B Modifieds | Results | | Jim Thies (A Modifieds) | 5th | - | 1st | 24th (DNF) |
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| 7/16/2021 | Crawford County Speedway - Denison, IA Regular Night All Classes-$1000 to win Sport Mods 305 Sprints - Winged, Hobby Stocks, Stock Cars, A Modifieds, B Modifieds, Hornets | Results | | Jim Thies (A Modifieds) | 1st | - | - | 11th (DNF) |
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| 7/17/2021 | Shelby County Speedway - Harlan, IA Shelby County Fair Hobby Stocks, Stock Cars, A Modifieds, B Modifieds, Dirt Late Models, Vintage Full Body Stock Cars, Sport Compact | Results | | Jim Thies (A Modifieds) | 3rd | - | - | 1st |
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| 7/18/2021 | Interstate Speedway (SD) - Jefferson, SD IMCA Weekly Racing IMCA Modified, IMCA Northern SportMod, IMCA Stock Car, IMCA Hobby Stock, IMCA Sport Compact | Results | | Jim Thies (IMCA Modified) | 2nd | - | - | 9th (DNF) |
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| 7/23/2021 | Crawford County Speedway - Denison, IA Regular Night All Classes-Fair Night 305 Sprints - Winged, Hobby Stocks, Stock Cars, A Modifieds, B Modifieds, Hornets | Results | | Jim Thies (A Modifieds) | 4th | - | - | 3rd |
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| 7/26/2021 | Park Jefferson International Speedway - Jefferson, SD $1,000 to win IMCA Fast Shafts Qualifier at Park Jefferson B Modifieds, IMCA Modified, IMCA Northern SportMod, IMCA Stock Car, IMCA Hobby Stock | Results | | Jim Thies (IMCA Modified) | 6th | - | - | 4th |
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| 7/30/2021 | Crawford County Speedway - Denison, IA Regular Night All Classes-$1000 to win Modified 305 Sprints - Winged, Hobby Stocks, Stock Cars, A Modifieds, B Modifieds, Hornets | Rain Out |
| 8/1/2021 | Interstate Speedway (SD) - Jefferson, SD IMCA Weekly Racing IMCA Modified, IMCA Northern SportMod, IMCA Stock Car, IMCA Hobby Stock, IMCA Sport Compact | Results | | Jim Thies (IMCA Modified) | 1st | - | - | 1st |
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| 8/6/2021 | Crawford County Speedway - Denison, IA Regular Night All Classes-$1000 to win Sprint Cars 305 Sprints - Winged, Hobby Stocks, Stock Cars, A Modifieds, B Modifieds, Hornets | Results | | Jim Thies (A Modifieds) | 3rd | - | - | 5th |
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| 8/8/2021 | Interstate Speedway (SD) - Jefferson, SD IMCA Weekly Racing IMCA Modified, IMCA Northern SportMod, IMCA Stock Car, IMCA Hobby Stock, IMCA Sport Compact | Results | | Jim Thies (IMCA Modified) | 4th | - | - | 10th (DNF) |
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| 8/10/2021 | Park Jefferson International Speedway - Jefferson, SD J&J Fitting Iron Cup Night 2 B Modifieds, IMCA Modified, IMCA Northern SportMod, IMCA Stock Car, IMCA Hobby Stock, IMCA Sport Compact | Results | | Jim Thies (IMCA Modified) | 4th | - | - | 19th (DNF) |
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| 8/13/2021 | Crawford County Speedway - Denison, IA Regular Night All Classes-$600 to win Hobby Stock and $400 to win Sport Compact 305 Sprints - Winged, Hobby Stocks, Stock Cars, A Modifieds, B Modifieds, Hornets | Results | | Jim Thies (A Modifieds) | 3rd | - | - | 8th |
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| 8/21/2021 | Shelby County Speedway - Harlan, IA IMCA Sunoco Late Model & Season Smack Down Hobby Stocks, Stock Cars, A Modifieds, B Modifieds, Dirt Late Models, Sport Compact | Results | | Jim Thies (A Modifieds) | 2nd | - | - | 5th |
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| 8/22/2021 | Interstate Speedway (SD) - Jefferson, SD IMCA Weekly Racing IMCA Modified, IMCA Northern SportMod, IMCA Stock Car, IMCA Hobby Stock, IMCA Sport Compact | Results | | Jim Thies (IMCA Modified) | 1st | - | - | 4th |
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| 9/4/2021 | Boone Speedway - Boone, IA Wild Rose Casino Prelude to the Super Nationals IMCA Modified, IMCA Stock Car, Pro Dwarf, IMCA Mod Lite | Results | | Jim Thies (IMCA Modified) | 7th | - | 13th | - |
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| 9/8/2021 | Boone Speedway - Boone, IA 2021 IMCA Speedway Motors Super Nationals Fueled by Casey’s IMCA Modified, IMCA Northern SportMod, IMCA Stock Car, IMCA Hobby Stock | Results | | Jim Thies (IMCA Modified) | 2nd | - | - | - |
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| 9/9/2021 | Boone Speedway - Boone, IA 2021 IMCA Speedway Motors Super Nationals Fueled by Casey’s Sportsmans, Midwest Modifieds, Vintage Full Body Stock Cars, IMCA Modified, IMCA Stock Car | Results | | Jim Thies (IMCA Modified) | 7th | - | 18th (DNF) | - |
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| 9/10/2021 | Boone Speedway - Boone, IA 2021 IMCA Speedway Motors Super Nationals Fueled by Casey’s Generic 2, IMCA Modified, IMCA Stock Car | Results | | Jim Thies (IMCA Modified) | 3rd | - | - | 21st |
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| 9/11/2021 | Boone Speedway - Boone, IA 2021 IMCA Speedway Motors Super Nationals Fueled by Casey’s Midwest Modifieds, Vintage Full Body Stock Cars, Vintage Modifieds, Generic 1, IMCA Modified, IMCA Northern SportMod, IMCA Stock Car, IMCA Hobby Stock | Results | | Jim Thies (IMCA Modified) | 10th | - | - | - |
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