In 1934 in preparation for the Indianapolis 500 Horn practiced in a car called the Mick Special. However, he did not feel comfortable with the car and decided against trying to qualify it. Throughout that summer he campaigned a sprint car on a rigorous schedule once again in the east and midwest. He was successful enough to attract the attention of Harry Miller. Preston Tucker was putting together an ambitious effort with Miller and the Ford Motor Company for the 1935 Indianapolis 500. When asked by Miller, Horn accepted a ride in one of the new Miller Ford V8 cars. He did make the field for the 1935 Indy 500. Unfortunately a flaw in the design of the car would eventually result in the steering gear in the car to eventually freeze up and the car being impossible to steer. He dropped out of the race after 145 laps, most of which was spent fighting the steering problem.