Dave Thomas at the wheel of the 1948 Clancy 6-Wheeler. Photo: Jim HatfieldAl Unser drove the John Zink Special during the Carburetion Day demonstration. Photo: Jim HatfieldDave Thomas at the wheel of the 1948 Clancy 6-Wheeler. Photo: Jim HatfieldJohn Thomson at speed in the Geo Hoster Special. Photo: Jim Hatfield