Although he returned to race briefly in CART and IMSA in 1986. Ganassi achieved his top sportscar result in the 1986 Kodak Copies 500 at Watkins Glen that taking the Camel Light class victory, with his race partner, Bob Earl (7th overall). He also recorded a seventh-place finish a month early in the Löwenbräu Classic, at Road America, assisted by David Sears. Both times driving for Spice Engineering, in one for their Spice-Pontiac SE86CL. In what was to be his last international race outing, Ganassi was entered into the 1987 24 Hours of Le Mans, as a member of the Kouros Racing. One of his teammates for the event, Johnny Dumfries set the fastest lap of the race prior to handing the car over to Ganassi upon whom the gearbox broke.