Yes, sub 12 on a sticky track, in cool weather, with drag radials, 4.10 gears and a 3000 rpm stall TC. I've got the time slips. In warmer weather, the car tends to run mid 12s. And it weighs a bit less than you might think - 3850 lbs with me in it, thanks to the aluminum block, fiberglass hood, and skinnies on aluminum spare wheels.
The ZL1 has me way outgunned with 580 Hp, but my friend is still learning how to launch it, and he is running on street tires. His best run to date has been about 12.7 seconds. Chevy engineers have run an 11.9x on drag radials.
1997 Thunderbird Sport
5.0L-2V PI S/C
540 RWHP / 492 RWTQ
11.28 @ 123 MPH