McQuinn won 1938, 1939, and 1940 track championships at the 124th Field Artillery Armory in Chicago, the 1937 and 1938 Walsh Stadium track championships in St. Louis in 1937 and 1938, the 1938 Riverview track championship in Chicago, and the 1938 track title at the Milwaukee Mile. McQuinn won 61 feature races in 1938, which ranked him second behind Wally Zale. McQuinn raced in 10 Indianapolis 500 races, with career-best seventh-place finishes in 1938 and 1941.
After McQuinn retired, he was appointed the chief steward at Indianapolis, and the head of the champ car division for AAA and USAC. He died on January 1, 1986, before he could attend his induction in the National Midget Auto Racing Hall of Fame later that year.
Indianapolis 500 results
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