Just before the season opener of the American Le Mans Series (ALMS) at the Sebring International Raceway in Florida this past weekend, GM aired an aggressive commercial touting its 638-horsepower-strong Corvette ZR1. The ad claims that the firm�s engineers had to reduce the stock ZR1�s LS9 engine output by 168HP in order to compete in the race and �just to be fair against Porsche, Ferrari and BMW�.
For one, the Corvette ALMS racers are actually powered by a V8 loosely based on the Z06�s LS7 engine (see the second video after the jump). Perhaps most importantly, the Corvettes finished third and fourth in the GT class in Sebring behind two BMW M3 GTs� Videos follow after the break.
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