2009 Chevrolet Corvette ZR1 power figures announced: 638 horsepower, 6

[Karlo]

638. That's the number of SAE-certified horsepower packed into the 2009 Chevrolet Corvette ZR1's supercharged 6.2-liter V-8, along with 604 lb-ft of torque.

More... (http://www.motortrend.com/features/auto_news/2008/112_0804_2009_chevrolet_corvette_zr1_horsepower)