 Division 1 of NASCAR Whelen All-American Series racing at Seekonk Speedway are the pro stocks, also known as super late models at many other tracks.The pro stocks at Seekonk Speedway run either a tube frame chassis or straight rail chassis on 10 inch American Racer racing slicks.The engines are 358 cubic inch crate engines sold by General Motors and Ford Motor Company, generating ~400-450 horsepower.