I have taken my ZL1 to the tire shop to swap out my winter tires and install my OEM Eagle F1-G2 tires, and I was lucky enough that they were able to squeeze me in for an alignment. I asked them to do the track alignment according to the ZL1 owners videos produced by Chevrolet.

This Factory video can be seen here on YouTube:

http://youtu.be/2V1YQVZXzxw

The owners videos list the exact amount of negative camber to dial in for both front and rear for the track set up:

Front Camber: -1.50 degrees
Front Sum Toe: +0.10 degrees
Rear Camber: -0.75 degrees
Rear Sum Toe: +0.10 degrees

BUT...The shop informed me that they would not be able to adjust the front camber due to the fact that there are no factory adjustments for this; that they would have to remove the front shock, put in a shim, drill out and oblong the mounting hole, and so on. This stunned me.

Why would GM give track specific adjustments and then not give us the ability to make said adjustments? Again, this was only for the front camber.*The shop I went to is reputable, and I have no reason to believe they were being lazy or anything along those lines.*Now for my question:*has anyone one here had these adjustments done or know someone who has had them done on their ZL1 or 1LE? I am very interested to find out if it is, in fact, possible to make these changes or not.*

Appreciate the combined wisdom and experience of this group of Performance Drivers.

I am not very good at alignment stuff, but here is my two cents worth. I have a 2011 SS and last fall had the local GM dealer do the following alignment:

Front Camber -1.25
Front Toe 0.00

Rear Camber -0.50
Rear Toe IN 0.10
Rear Total Toe IN 0.20

The car did not have the required bolt on the front struts to hold it in place to make the camber adjustment, and GM was talking about ordering them in for $30 apiece or something crazy like that. Quick email to JusticePete, and he confirmed that any 1.5 pitch 10mm bolt would do. 50 cents in parts later, bolt in place, adjustment done. Hole for bolt was already there, no drilling required. But again, mine is an SS, not a ZL1.

Not sure if any of that helps but there ya go.

Pete

Your shop does not know what they are doing. I had the same problem when I tried to get the dealer to dial in specs as recommended by Pfadt for my car. Dealer could not figure it out. Fast forward a few months and I found an alignment shop that is well known for there alignment of track cars. Took the car there and about an hour later the car is set to recommended specs. No special tools, parts, or other. There are limits to the amount of alignment change that can be dialed in with stock parts. Getting -1.5 camber in the front is possible on the SS so I am certain it is possible on the ZL1.

That being said, do you track your car regularly? If not, I would recommend against the alignment change. Dialing in performance alignment for a road course will cause the car to be "darty" on public roads. It will tend to follow imperfections in the road much more.

A M10 X about 30mm?? set screw screws into the knuckle up against the strut. Use locktite!