IMCA Modified is the top modified division sanctioned by the International Motor Contest Association. The series began in 1979. It was designed to be a mid-level class between Late Models and Hobby Stocks. The first IMCA modified race was held at the Benton County, Iowa Speedway in 1979 on a 1/4 mile track. The car bodies are a hybrid of an open wheel car and a stock car. The front tires have no body around them like an open wheel car, and the back wheels have a body around them like a stock car. The series has a $1,050 engine claim or $100 and exchange rule, and a one tire rule.