Terry is the chief car tester for Emery Motors and Frank is an Engineer. Jane has just been hired to work in publicity. Frank and Terry both want Jane to be their girl. Terry has designed a new carburetor that should bring him fame and money, but he cannot get it to work correctly. Terry and Gadget have tested it for over a year, but it still is not perfected. Emery Motors assigns Frank to help Terry with the carburetor, but Terry is not happy because Frank is an Engineer and is also vying for Jane. They finish the carburetor, and to test it, they enter a car in the Indianapolis 500 race. Terry is not yet satisfied with the carburetor before the big race even though it has passed all the tests.
Acting
Young Jimmy Stewart already doing that nervous charm thing
Production
Actual Indy 500 footage smuggled into a B-picture

Director
Edwin L. Marin
Trivia, insights & behind the scenes
This was James Stewart's first leading role after years of bit parts—MGM was testing if America's future everyman could carry a picture.
Pre-code films could show working-class heroes with sex lives and professional ambition; this romance triangle would've been neutered just two years later under the Hays Code.