Corvette endurance car sponsored by DX Oil. The car in front is interesting. It is a Porsche 917 LH, a blindingly fast long distance racer. Light weight cars that made drivers very nervous with cracks developing in the frame. They ended up putting an air pressure gauge on the frame then filled the frame with compressed air. If the driver saw a sudden loss of air pressure it was time to head for the pits. The 917 series of Porsche race cars came to a conclusion with Can Am series killer, the Porsche 917 30 Sunoco machine driven by Mark Donohue.
The Corvette looks a little tired, probably towards the end of the race.
Am series killing Sunoco 917 30 driven by Mark Donohue
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