By Jeremy Fox OSKALOOSA, Iowa (June 25) – Jason Cook tuned up for next week’s Great American Budweiser Stock Car Shootout by winning Wednesday’s main event at Southern Iowa Speedway.Brandon Jay led early in the 18-lapper with Cook knocking on the door before the only caution of the race flew on lap two, when Damon Murty got sideways and collected Todd Reitzler, Doug Sylvester and Brock Welch. Murty got moving before the yellow came out, kept his spot for the ensuing restart and was briefly in second before Cook got the position back, then passed Jay for the lead on lap five.Cook appeared to be heading to the win but Murty and Cayden Carter didn’t make it easy for him. Carter grabbed the lead coming to the white flag but Cook took back coming to the checkered to pick up his first win at Osky. Carter, Murty, Corey Stout and Jay rounded out the top five. Rookie A.J. Johnson led the first lap in the Musco Lighting IMCA Modified 15 lap feature. Andrew Schroeder worked his away around on lap two. The only caution of the contest came on lap nine.Schroeder held on to take the win, Carter was second, and Johnson was third. Casey Greubel and Scott Dickey were fourth and fifth, respectively.Curtis VanDerWal paced the KBOE Radio IMCA Northern SportMods. Top Pepsi Cola IMCA Sunoco Hobby Stock honors went to Mike Hughes and Shaun Slaughter won the Mach-1 Sport Compact main event.