Indianapolis Motor Speedway, Indiana May 30, 2005 Dave Thomas at the wheel of the 1948 Clancy 6-Wheeler.Photo: Jim Hatfield Al Unser drove the John Zink Special during the Carburetion Daydemonstration.Photo: Jim Hatfield Dave Thomas at the wheel of the 1948 Clancy 6-Wheeler.Photo: Jim Hatfield John Thomson at speed in the Geo Hoster Special.Photo: Jim Hatfield