Track of Thunder

Track of Thunder is a 1967 stock car racing film starring Tommy Kirk.

It turns out Georgina is in cahoots with Maxwell Carstairs, manager of the racetrack, who has been hired by a syndicate to turn the sport into a lucrative gambling venture the articles are to increase attendances.Bobbys mechanic, Bowswer Smith, exposes the truth. Bobby refuses to drive Carstairs car in the big race so Bowser replaces him and is killed. ........

Source: Wikipedia