Fever Heat (1968)

Ace Jones (Nick Adams) is a ex-stockcar racer who finds himself in need of repairs on his truck. The garage is owned by a young widow Sandy (Jeannine Riley), whose husband was killed in a racing accident at the local track. He gets a job as a mechanic helping the veteran wrench-man Toad (Vaughn Taylor) and eventually takes over the racetrack. Two of his friends are the victims of sabotage and lose their lives in a fiery crash. Ace then decides to leave the life in the fast lane behind and settle down with Sandy.