Thanks again Dwight,

According to Stan Kalwainski's great website (chicagolandautoracing.com), USAC ran 66 times at the Willow Springs track, including both sprints and midgets. I seem to remember the midgets running on the 1/4 and the sprints on the 1/2, but that might have been the Outlaws.

Here's what Stan has "Records show that USAC sanctioned a total of 66 races between 1964 and 1995. Bob Tattersall of Streator, Ill. won the first midget race on July 10, 1964 with Tony Stewart winning the last sprint car race in July of 1995. A total of 38 different drivers were victorious in the USAC competition in those 66 races with Ron