Here a the car & driver reviews, obviously their numbers are a bit slower than what GM advertises as the 0-60 times, I'm sure they took the best out of 100 runs to get the times they advertise.

from C&D Z06 Review
GM says the Corvette 5.5 will reach 60 mph in less than four seconds and polish off the quarter-mile in 12.4 seconds. Considering we've had trouble slipping 460-hp Vipers under the four-second mark and that a Z06 has never hit 60 in less than 4.3 seconds by our hands or reached 1320 feet in less than 12.7 seconds, it's possible we won't be able to substantiate these claims.
The fact that the Corvette 5.5 may be only slightly faster than the 5.4 will be of little comfort to 2001 Z06 owners, whose identity will soon be made obvious to everyone by the new fender badges with "Z06 405 HP" written on them. True, GM isn't offering any free upgrades, but if you really bitch, perhaps it'll send you two of those.

from C&D C5 M6 Review
Despite a softer launch at Atlanta Dragway than we normally achieve at our sticky test track in Michigan, the preproduction 1997 Corvette hit 60 mph in 4.9 seconds and 100 mph in 11.4 seconds and swallowed up the quarter-mile in 13.4 seconds at 108 mph.

from C&D C5 A4 Review
But when it comes to acceleration, the automatic cant match the manual. The quickest way out of the hole is to brake-torque the car briefly with the traction control turned off. That allows a whiff of helpful wheelspin, launching us to 60 mph in 5.3 seconds and through the quarter-mile in 13.8 seconds. The best manual Corvette we tested could beat both those times by a half-second.