The 65th running of the Indy 500 held back in 1981 saw an interesting machine line up on the event's 33-car grid. A four-time winner at the Brickyard, Al Unser Sr was at the wheel of a Cosworth DFX-powered Longhorn which was actually a reconditioned Williams FW07 updated to IndyCar specs, a car Alan Jones had originally driven to the F1 world championship title in 1980. Despite the #88 car's prestigious pedigree, it wasn't of much help to Unser who was classified 17th at the end of the day, 34 laps down. There was a reason to rejoice however for the Unser family, with brother Bobby taking his third Indy 500 win on the day, driving for Team Penske.
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