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Nothing inherently wrong with push rods. Penske found a loop hole in rules for Indy. He had ilmore-chevy push rod engine designed and dominated 500 until both cars crashed. Fittipaldi had 2 laps on field when trying to pass Unser Jr(2nd penske car running in 2nd place with 1 lap on field) when he crashed out of turn 4. So going for 3 lap lead.
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