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| 4/16/2021 | Marshalltown Speedway - Marshalltown, IA Hoker Trucking East Super Late Models Series Kevin "Sharp Shooter" Miller Lite 30 Dirt Super Late Models: SLMR Late Model Series Dwarf, IMCA Modified, IMCA Northern SportMod, IMCA Stock Car, IMCA Hobby Stock | Results | | Greg Kastli (Dirt Super Late Models) | 2nd | - | - | 10th |
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| 4/17/2021 | Independence Motor Speedway - Independence, IA Sport Mods & Stock Cars $750 to Win DIRTcar Sport Compact, Hobby Stocks, Stock Cars, A Modifieds, Stock Non-Wing, B Modifieds, Dirt Late Models | Results | | Greg Kastli (A Modifieds) | 3rd | - | - | 8th |
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| 4/18/2021 | Benton County Speedway - Vinton, IA Weekly IMCA Racing Season Opener IMCA Modified, IMCA Northern SportMod, IMCA Stock Car, IMCA Hobby Stock, IMCA Sport Compact | Results | | Greg Kastli (IMCA Modified) | 2nd | - | - | 6th |
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| 5/1/2021 | Independence Motor Speedway - Independence, IA Caseys Night DIRTcar Sport Compact, Hobby Stocks, Stock Cars, A Modifieds, Stock Non-Wing, B Modifieds, Dirt Late Models | Results | | Greg Kastli (A Modifieds) | 5th | - | - | 16th |
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| 5/2/2021 | Benton County Speedway - Vinton, IA Weekly IMCA Racing Plus Late Models Dirt Late Models, IMCA Modified, IMCA Northern SportMod, IMCA Stock Car, IMCA Hobby Stock, IMCA Sport Compact | Results | | Greg Kastli (Dirt Late Models) | 4th | - | - | 12th |
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| 5/6/2021 | Marshalltown Speedway - Marshalltown, IA Dale DeFrance Memorial Thursday Night Thunder Dwarf, IMCA Late Models, IMCA Modified, IMCA Northern SportMod, IMCA Stock Car, IMCA Hobby Stock | Results | | Greg Kastli (IMCA Late Models) | 1st | - | - | 4th |
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| 5/9/2021 | Benton County Speedway - Vinton, IA Weekly IMCA Racing Plus Micro Sprints Winged Outlaw, IMCA Modified, IMCA Northern SportMod, IMCA Stock Car, IMCA Hobby Stock, IMCA Sport Compact | Results | | Greg Kastli (IMCA Modified) | 4th | - | - | 8th |
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| 5/15/2021 | Independence Motor Speedway - Independence, IA Albert Auto Night DIRTcar Sport Compact, Hobby Stocks, Stock Cars, A Modifieds, Stock Non-Wing, B Modifieds, Dirt Late Models | Results | | Greg Kastli (A Modifieds) | 4th | - | - | 5th |
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| 5/21/2021 | 300 Raceway - Farley, IA Truck Country 50 Dirt Super Late Models: Lucas Oil Late Model Dirt Series A Modifieds, B Modifieds, CRUSA Dirt Late Models, IMCA Modified | Results | | Greg Kastli (A Modifieds) | 8th | - | - | 15th |
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| 5/22/2021 | Independence Motor Speedway - Independence, IA Myers Polaris Night DIRTcar Sport Compact, Hobby Stocks, Stock Cars, A Modifieds, Stock Non-Wing, B Modifieds, Dirt Late Models | Results | | Greg Kastli (A Modifieds) | 2nd | - | - | 9th | | Greg Kastli (Dirt Late Models) | - | - | - | - |
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| 5/23/2021 | Benton County Speedway - Vinton, IA Weekly IMCA Racing Plus A.I.R.S Cars Vintage Full Body Stock Cars, IMCA Modified, IMCA Northern SportMod, IMCA Stock Car, IMCA Hobby Stock, IMCA Sport Compact | Results | | Greg Kastli (IMCA Modified) | 4th | - | - | 7th |
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| 5/30/2021 | Benton County Speedway - Vinton, IA Benton County Speedway - EAST Dirt Super Late Models: SLMR Late Model Series Dirt Late Models, IMCA Modified, IMCA Northern SportMod, IMCA Stock Car, IMCA Hobby Stock, IMCA Sport Compact | Results | | Greg Kastli (IMCA Modified) | 3rd | - | - | 12th |
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| 6/5/2021 | Independence Motor Speedway - Independence, IA Fahr Beverage Mid Season DIRTcar Sport Compact, Hobby Stocks, Stock Cars, A Modifieds, Stock Non-Wing, B Modifieds, Dirt Late Models | Results | | Greg Kastli (A Modifieds) | 2nd | - | - | 8th |
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| 6/6/2021 | Benton County Speedway - Vinton, IA IMCA Weekly Racing Plus Legends Pro Legends, IMCA Modified, IMCA Northern SportMod, IMCA Stock Car, IMCA Hobby Stock, IMCA Sport Compact | Results | | Greg Kastli (IMCA Modified) | 1st | - | - | 7th |
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| 6/12/2021 | Hamilton County Speedway - Webster City, IA Karl Chevrolet Fan Appreciation Night + Kid's Night Dirt Super Late Models, Super Truck, USRA B-Mods, USRA Modifieds, USRA Hobby Stocks, USRA Stock Cars, USRA Tuners | Results | | Greg Kastli (Dirt Super Late Models) | 6th | - | - | 6th |
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| 6/13/2021 | Benton County Speedway - Vinton, IA Candy Dash for the Guinness Book of World Records Plus IMCA Weekly Racing IMCA Modified, IMCA Northern SportMod, IMCA Stock Car, IMCA Hobby Stock, IMCA Sport Compact | Results | | Greg Kastli (IMCA Modified) | 7th | - | - | 8th |
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| 6/18/2021 | Davenport Speedway - Davenport, IA Weekly Racing w/ Hoker Trucking SLMR Late Models Dirt Super Late Models: SLMR Late Model Series A Modifieds, B Modifieds, Street Stocks, Sport Compact | Results | | Greg Kastli (Dirt Super Late Models) | 6th | - | 11th | - |
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| 6/19/2021 | Independence Motor Speedway - Independence, IA Crawford Farms Hall of Fame Night DIRTcar Sport Compact, Hobby Stocks, Stock Cars, A Modifieds, Stock Non-Wing, B Modifieds, Dirt Late Models | Results | | Greg Kastli (A Modifieds) | - | - | - | - | | Greg Kastli (Dirt Late Models) | 3rd | - | - | 12th |
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| 6/25/2021 | Fayette County Speedway - West Union, IA Hooker Trucking Super Late Model East Series Late Model Special Dirt Super Late Models: SLMR Late Model Series Dirt Late Models, USRA B-Mods, USRA Hobby Stocks, USRA Stock Cars | Results | | Greg Kastli (Dirt Super Late Models) | 7th | - | - | 14th |
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| 7/4/2021 | Benton County Speedway - Vinton, IA Sprint Invaders - Benton County Speedway 360 Sprints - Winged: Sprint Invaders Winged Outlaw, IMCA Modified, IMCA Northern SportMod, IMCA Stock Car, IMCA Hobby Stock, IMCA Sport Compact | Results | | Greg Kastli (IMCA Modified) | 4th | - | - | 10th |
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| 7/6/2021 | Independence Motor Speedway - Independence, IA Buchanan County Fair Late Model Showdown Stock Cars, A Modifieds, Dirt Late Models, Vintage Full Body Stock Cars, Dwarf, IMCA Late Models | Results | | Greg Kastli (Dirt Late Models) | 4th | - | - | 15th |
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| 7/11/2021 | Benton County Speedway - Vinton, IA Urbana 5 - Weekly IMCA Racing Plus Legends Cars Pro Legends, IMCA Modified, IMCA Northern SportMod, IMCA Stock Car, IMCA Hobby Stock, IMCA Sport Compact | Results | | Greg Kastli (IMCA Modified) | 7th | - | 1st | 19th |
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| 7/21/2021 | Fayette County Speedway - West Union, IA Fayette County Fair Race - Rage Chassis 40 USRA B-Mods, USRA Hobby Stocks, USRA Stock Cars, IMCA Modified | Results | | Greg Kastli (IMCA Modified) | 7th | - | - | 10th |
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| 8/1/2021 | Benton County Speedway - Vinton, IA Weekly IMCA Racing Plus Legends Cars Pro Legends, IMCA Modified, IMCA Northern SportMod, IMCA Stock Car, IMCA Hobby Stock, IMCA Sport Compact | Results | | Greg Kastli (IMCA Modified) | 3rd | - | - | 8th |
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| 8/14/2021 | Independence Motor Speedway - Independence, IA Weekly Racing DIRTcar Sport Compact, Hobby Stocks, Stock Cars, A Modifieds, Stock Non-Wing, B Modifieds, Dirt Late Models | Results | | Greg Kastli (Dirt Late Models) | 3rd | - | - | 5th |
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| 8/15/2021 | Benton County Speedway - Vinton, IA Weekly IMCA Racing Plus Micro Mods & Legends Pro Legends, Dwarf, IMCA Modified, IMCA Northern SportMod, IMCA Stock Car, IMCA Hobby Stock, IMCA Sport Compact | Results | | Greg Kastli (IMCA Modified) | 4th | - | - | 6th |
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| 8/22/2021 | Benton County Speedway - Vinton, IA Season Championship IMCA Modified, IMCA Northern SportMod, IMCA Stock Car, IMCA Hobby Stock, IMCA Sport Compact | Results | | Greg Kastli (IMCA Modified) | 5th | - | - | 8th |
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