Indianapolis Motor Speedway, IndianaMay 16, 2015 Jeffrey Urwin’s ex-Mario Andretti 1977 McLaren M24 leads Bruce Linsmeyer’s ex-Joe Leonard 1968 Lotus 56 Turbine. Photo: Dan R. Boyd Guest of honor Al Unser was reunited with the PJ Colt-Ford he drove to the first of his four 500 victories in 1970.Photo: Eric Drumwright Joe Freeman’s 1952 Kurtis KK500A was driven to 4th place in the 1954 500 byTroy Ruttman.Photo: Dan R. Boyd Rob Dyson drove his 1927 Miller 122, the Boyle Valve Special.Photo: Dan R. Boyd