An anonymous sponsor has added extra prize money for Saturday's Valvoline American Late Model Iron-Man Series event at Atomic Speedway near Chillicothe, Ohio.

In addition to the announced $5,000-to-win purse, heat races will pay $100, $50 and $25 to the top three finishers. Another $100 and $50 will go to the two drivers not transferring from consolation races and the three highest-finishing steel-block engine entries in the main event will receive $100, $50 and $25.