SPENCER, Iowa – The finale for the 2018 Arnold Motor Supply Dirt Knights Tour is Monday, Aug. 6, when IMCA Modifieds headline the Clay County Fair Speedway show.A top check of $2,000, along with a berth on the Fast Shafts All-Star Invitational ballot are at stake as the series travels to Spencer, hometown of tour title sponsor Arnold Motor Supply.Arnold Motor Supply provides a portion of the $10,000 point fund and also awards a Traeger Lil’ Tex Elite Pellet Grill to the champion of the ninth annual tour.Hunter Marriott has the current point lead and two previous Clay County tour victories to his credit. The Brookfield, Mo., driver won at Spencer in 2016 and again last year. Drivers’ six best finishes over the course of the seven-date series will be used to determine point standings because of events held out of state and drivers in contention for the tour championship are aware of that scoring.One hundred and seventy drivers from 14 states have competed in one or more of the first six tour events this season. Marriott motored his way to the top of the point standings with victories in two of the last three races.Pit gates and the grandstand at Spencer open at 4:30 p.m. Hot laps are at 6:30 p.m. with racing to follow. Grandstand admission is $15 for adults and free for kids 12 and under. Pit passes are $30.Completing the Monday night card are IMCA Sunoco Stock Cars, IMCA Sunoco Hobby Stocks, Karl Chevrolet Northern SportMods and Mach-1 Sport Compacts.The event will be broadcast by IMCA.TV.Arnold Motor Supply Dirt Knights Tour top 20 point standings – 1. Hunter Marriott, Brookfield, Mo., 228; 2. Joel Rust, Grundy Center, 195; 3. Troy Cordes, Dunkerton, 191; 4. Ricky Thornton Jr., Clive, and Kelly Shryock, Fertile, both 189; 6. Kyle Brown, Madrid, 180; 7. Kyle Strickler, Troutman, N.C., 152; 8. John Parmeley, Phoenix, Ariz., 143; 9. Corey Dripps, Reinbeck, 134; 10. Jason Wolla, Ray, N.D., 133; 11. Shane DeMey, Denison, 131; 12. Al Hejna, Clear Lake, 125; 13. Chris Abelson, Sioux City, 109; 14. Josh Most, Red Oak, 96; 15. Cody Bauman, Eureka, Ill., 95; 16. Ethan Dotson, Bakersfield, Calif., 94; 17. Brock Bauman, Eureka, Ill., 93; 18. Jeremy Thornton, Casa Grande, Ariz., and David Brown, Kellogg, both 77; 20. Cayden Carter, Oskaloosa, 67.