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Take it to another shop that will "check" it N/C and see if they come up with the same specs. Chances are that even the original shop would have gotten different readings if they put it back on the same rack. Are you near any Corvette specialty shops that can inspect the undercarriage of the car to see if it's damaged, or did you buy the car new and never bottom out the car?
I went to tire garage which was recomended by good corvette specialist.
He serviced the car about 3 months ago, I`ll go to check the suspension , but i was curious that there is really no way to adjust the camber. When You lower Your car You have to adjust it somehow i think
Yes, the camber/caster is fully adjustable. I once had Sears do an alignment and they said that it was out of range. bs, THEY JUST DIDN'T KNOW HOW TO ADJUST IT. I now do my own.
The C5 is one of the few cars that still has a huge range of full adjustment on the front end, as well as the rear. THIS page has some good photos of the C5 front adjustment points. Look about 2/3 down the page. Even if yours is out of adjustable range it can still be aligned properly by installing shims (GM uses washers) behind the upper control arm.
Note: A word of warning, the C5 upper control arms are easily bent. When they bend they normally always will go more negative on the camber like yours is showing. If you have hit a curb or big pothole it is possible you have a bent control arm. I would only suspect a bent arm if the adjustment is out of the adjustable range. In your case is sounds like the shop don't know what they are doing. But, I can't imagine ANYONE that has ever used a front end alignment machine not knowing how to adjust the camber on a C5 front end. I could only think they may have just assumed there is no adjustment, because 90% of the cars now days don't have any or little front end adjustments.