[Stingray]

Latest leaks today also reveal this via google'ing... 620 hp and 650 tq

And from GM Authority:
"The 2015 Corvette Z06 is going to be officially revealed on January 13, 2014 — exactly one year after the official debut of the 2014 Corvette Stingray. There will also be a live stream of the event, for those of you who will not be attending the press conference in person. Yet before that even manages to happen, it seems the performance figures of the 2015 Z06 have been leaked. And the horsepower and torque figures are downright brutal.

According to metadata (the lines of text that show up under a link in search result) from Chevrolet themselves, the 2015 Corvette Z06 will produce a staggering 620 horsepower, and a ground-twisting 650 foot-pounds of torque, as seen above. Holy smoking tires.

The power bump is 115 hp and 180 lb-ft more than the outgoing Z06 with the already powerful LS7 7.0L V8 engine. It’s anticipated that the 2015 Corvette Z06 will utilize a supercharged LT4 V8 in place of a naturally aspirated engine. Even more impressive, is that the torque figure is 46 lb-ft greater than that of the outgoing, LS9-powered, range-topping Corvette ZR1. More eye-opening is that the numbers are not quite finalized yet, so we could even see gains from those estimations. The 2015 Z06, ladies and gentlemen, is shaping to be nothing short of a monster."

Read more: http://gmauthority.com/blog/2014/01/2015-corvette-z06-power-figures-leak-features-more-torque-than-outgoing-zr1/#ixzz2pk6KoSrb