Some of the 1981-1991 IMSA GTO/GTP Class.
1991 Oldsmobile Cutlass. # 6. driven by Gordon Johnson
1991 Chevrolet Camaro # 33, driven by Bill Ockerland
1986 Porsche 962 # 10 A driven by Joe Robillard
1991 Eagle Mark 3 # 99T driven by Charles Nearburg.
( Ken H photos. )