Richard Childress Racing in the NASCAR Cup Series at Iowa Speedway… The NASCAR Cup Series returns to Iowa Speedway this weekend for the Iowa Corn 350 Powered by Ethanol, marking the Cup Series’ third appearance to the 0.875-mile, D-shaped oval designed by Rusty Wallace. 3 Get Bioethanol Chevrolet at Iowa Speedway… Sunday’s Iowa Corn 350 Powered by Ethanol will mark Austin Dillon’s third career NASCAR Cup Series start at Iowa Speedway. 33 Cheddar’s Scratch Kitchen Chevrolet at Iowa Speedway… Austin Hill will make his first NASCAR Cup Series start at Iowa Speedway on Sunday. 2 Whelen Chevrolet at Iowa Speedway… Jesse Love has made two career NASCAR O’Reilly Auto Parts Series starts at Iowa Speedway. 21 Bennett Transportation and Logistics Chevrolet at Iowa Speedway… Austin Hill will make his second NASCAR O’Reilly Auto Parts Series start at Iowa Speedway on Saturday.