Can anyone help by providing specs for caster, camber and toe for a 2008 Impala SS? I used some toe plates from my racing days and measured it and I am toed out 3/8". I would guess ideally I should be toed-in slightly.

Wow, of all the years I have been on car forums, and you would be the first one to ask about alignment. I have no clue. Alldatadiy.com or even the FSM should be able to tell you exactly what you need.

Odd, I was thinking they try and zero out the toe for tire wear. Same with camber.

You would be surprised. They dont zero them alot of times. I would say it would be best to get it aligned professionally. I know where i work its only 75 dollars for a alignment.

you dint want to go zero because it gets darty. alot do a slighty left to fight the crown in the road.

• For the front end, the caster angle can range from +2.40 degrees to +3.40 degrees, with the ideal setting being +2.90 degrees. The camber angle can range from -1.30 degrees to -.30 degrees, with the ideal setting being -.80 degrees. The toe-in can range from -.10 degrees to +.30 degrees. The steering-wheel angle can range from -3.50 degrees to +3.50 degrees, but ideally it should be evened out at zero degrees.

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  For the rear end, the camber angle can range from -1.15 degrees to -.15 degrees, with the ideal being -.65 degrees. The total toe can range from -.10 degrees to +.30 degrees, with the ideal setting being +.10 degrees. The thrust angle can range from -.15 degrees to +.15 degrees. The caster angle is not adjustable on the rear end.
  
  

Alignment Specs for the Sport Suspension System

• For the front end, the caster angle can range from +2.65 degrees to +3.65 degrees, with the ideal setting being +3.15. The camber angle can range from -1.20 degrees to -.20 degrees, with the ideal setting being -.70 degrees. The toe-in can range from -.10 to +.30 degrees. The steering-wheel angle can range from -3.50 degrees to +3.50 degrees, but ideally it should be evened out at zero degrees.

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  For the rear end, the camber angle can range from -1.40 degrees to -.40 degrees, with the ideal setting being -.90. The total toe can range from -.10 degrees to +.30 degrees, with the ideal setting being +.10 degrees. The thrust angle can range from -.15 degrees to +.15 degrees. The caster angle is not adjustable on the rear end.
  
  
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Alignment Specs for the SEO Vehicle Police Car and the SEO Vehicle Police Car LC

• For the front end of cars with the SEO Vehicle Police Car suspension system, the caster angle can range from +2.70 degrees to +3.70 degrees, with the ideal setting being +3.20 degrees. The camber angle can range from -1.00 degrees to zero degrees, with the ideal setting being -.50 degrees. The toe-in can range from -.10 degrees to +.30 degrees. The steering angle can range from -3.50 degrees to +3.50 degrees, but ideally it should be evened out at zero degrees.

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  For the front end of cars with the SEO Vehicle Police Car LC suspension system, the caster angle can range from +2.55 degrees to +3.55 degrees, with the ideal setting being +3.05. The camber angle can range from -1.15 degrees to -.15 degrees, with the ideal setting being -.65 degrees. The toe-in can range from -10 degrees to +.30 degrees. The steering angle can range from -3.50 degrees to +3.50 degrees, but ideally it should be evened out at zero degrees.
  The rear-end alignment specs are the same for the SEO Vehicle Police Car and the SEO Vehicle Police Car LC. The camber angle can range from -1.20 degrees to -.20 degrees, with the ideal setting being -.70 degrees. The total toe can range from -.10 degrees to +.30 degrees, with the ideal setting being +.10 degrees. The thrust angle can range from -.15 degrees to +.15 degrees. The caster angle is not adjustable on the rear end.

Any car I have ckecked alignment specs for show slight toe in. One time when I did front suspension work on my Bonneville I set the two front tires to be parallel to each other, and it didn't drive right. Tended to wander when driving on the expressway in a straight line. Money spent on a proper alignment is the way to go.

Thanks for the specs. These confirm what I had seen when doing a search. What I have gathered is a negative camber will provide a sportier handling ride and maybe a little better fuel mileage but compromised tire wear.
Toe-in slightly is optimal and I think that is where I am now using racing guages. I am going to spend the $30 for an alignment check rather than letting them adjust. Pep Boys really wanted to screw me on price of adjustments on camber, and they didn't know what they were doing with camber. They also weren't very accurate with their adjustments on toe.