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This is better, more consistent and less likely to have more rapid inside should wear due to camber being as negative as it had been. Good street performance and tire life settings. The technician did spend the time and effort to get it right even if many angles were withing the spec already - he made it better.
Now rear caster is not readable by a regular alignment system and must be measured directly with an inclinometer and mounting bracket. No idea is that is correct and some have had some issues with strange handling if it is out.
Might want to search for rear caster adjustment and read up on that topic.
Just got the Z back from the dealer after an alignment. Please see attached and let me know if changes were for better or worse.
Your before adjustments look like the way many cars are delivered from the factory. The current numbers look almost dead on to GM Factory Service Manual Specifications. The only thing missing is the rear caster measurement.
Here is what the FSM shows as the alignment specs for the C7.
FE1 through FE4 are for the Stingray and FE6 and FE7 are for the Z06. Since this is from the 15 FSM I am not sure where the GS falls since I don't know which suspension RPOs come on them.
I had a similar rear toe before alignment. Both rear wheels were pointing to the same direction (toe-in on one, toe-out on the other) so every time when I stepped on the gas slightly hard, the rear end slided to one side. After the alignment, both rear ends were slightly pointing to each others or away from each other, the car kept going straight even when wheels were spinning.