The ZLE has a camber plate at the top of the front strut towers that you can rotate to the track position to allow for more negative camber in addition to loosening the two knuckle nuts shown in the video below and hammering the bolts halfway out to release the splines then pushing in on the top of the brake rotor and tightening those two nuts back up. But you don't want to move the top camber plate after you get an alignment because switching it between street an track positions also changes the front toe.
https://youtu.be/ZlZYmjIS_ZQ