Deaths and tragedy from 1973 Indy 500 opened the door for safety evolution in racing -
Rutherford won the pole with a record-breaking, four-lap average speed of 198.413 mph and Johncock wound up with the first of his two Indy wins, but it was a grim across the rest of Gasoline Alley.
Pretty much any successful IndyCar driver from that era - Johncock, Rutherford, Foyt, Mario Andretti, the Unser brothers, Parnelli Jones - felt the same way.PHOTOS: Deaths and tragedy from the 1973 Indy 500 opened the door for safety evolution in racing It reduced the size of rear wings by nine inches, cut fuel tank capacity from 75 gallons to 40, moved those tanks to the left sidepod away from the grandstands - and where most side impacts occur on oval tracks - and required pit-sign board holders to remain at their posts the entire race.
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