Chevrolet has confirmed that it was a batch of valve springs that led to the engine problems they experienced in St Petersburg. Jim Campbell, Chevrolet's US vice president of performance vehicles and motorsports, revealed that it was the valve springs that led to the to 11 of the 12 Chevrolet engines needing 'non-minor' repairs following the first round. “We identified a batch of valve springs that, due to a process change at one of our suppliers, may fracture before the full mileage requirement (2500 miles)," said Campbell. "We notified IndyCar of the issue and obtained approval to change the valve springs.” The change was made to 11 of Chevrolet’s 12 IndyCar engines, as...
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