Lap one. That’s all it took. Corey Day’s Hendrick Motorsports Chevrolet ran straight into a manhole cover that had no business being loose on a NASCAR track. It tore through his radiator at Turn 6 of the temporary street course NASCAR built through Naval Base Coronado. His crew chief got on the radio and said exactly what you’d expect: “We have a manhole cover sitting in our radiator.” Then things got interesting. NASCAR let Hendrick swap the ra…