September 4, 1950             North Iowa Fairgrounds, Mason City, IA      IMCA Stock Car      Alex Erickson
May 27, 1951             North Iowa Fairgrounds, Mason City, IA      IMCA Stock Car      Bill Harrison
August 15, 1951             North Iowa Fairgrounds, Mason City, IA      IMCA Stock Car      J.M. Wilson
August 19, 1951             North Iowa Fairgrounds, Mason City, IA      IMCA Stock Car      Art Combs
June 1, 1952             North Iowa Fairgrounds, Mason City, IA      IMCA Stock Car      Ralph Dyer
August 17, 1952             North Iowa Fairgrounds, Mason City, IA      IMCA Stock Car      Wally Dahl
May 31, 1953             North Iowa Fairgrounds, Mason City, IA      IMCA Stock Car      Don White
August 15, 1953             North Iowa Fairgrounds, Mason City, IA      IMCA Stock Car      Ernie Derr
August 14, 1954             North Iowa Fairgrounds, Mason City, IA      IMCA Stock Car      Don White
August 13, 1955             North Iowa Fairgrounds, Mason City, IA      IMCA Stock Car      Herschel Buchanan
August 11, 1956             North Iowa Fairgrounds, Mason City, IA      IMCA Stock Car      Johnny Beauchamp
August 10, 1957             North Iowa Fairgrounds, Mason City, IA      IMCA Stock Car      Johnny Beauchamp
June 29, 1958             North Iowa Fairgrounds, Mason City, IA      IMCA Stock Car      Bob Burdick