The Sprints are just too safe to race, the real reason for so many racers. Back in the day more than enough race cars was almost unheard of. As I remember if 15 racers showed up it was one good show and that was all they had, no other class. Lots of racers got killed back then or screwed up for the rest of their life. Only the bravest and the best raced Sprints. Rufus Turner in my town built his Sprint and used a Ranger airplane engine. I remember seeing the Sprint in his machine shop. Later on I went with him.