LS4 Performance - Rear tires worn on inside

Ok, so I crawled up under the car to get an idea on the exhaust system setup and notcied something very odd...
I noticed the rear tires were very worn on the insides. You'll have to excuse my lack of tire / suspension knowledge... but the rear tires are such that the lower portion is pushed out further than the top, like an A.
When I first bought the car I thought this was normal. The tires were well used and all worn evenly. Apparently not though.
So has anyone else seen this? My friend with a GTO says he has the same thing and he can't seem to keep it fixed, but then again he hates that car.

Please realize, this will soon be followed up with a tire thread lol.

Most w-bodies do this. My '06 monte ss did this as well as my wife's '04 comp g grand prix. What you need to buy are camber bolts and then take it in and get it aligned. Both of my cars have perfect tire wear now.

extremely common. LuSe4 hit the nail on the head.

Would you by chance have a link?

i notched my strut towers to allow for camber alignment, best way to do it. im lowered and everything is bang on(ive aligned it 4 times since buying the car lol cost is $0 for me since i work in a garage)

I do not have a link. But they should carry them at any parts store, or do a search on line. Pretty easy to find.

Check out rockauto.com. Enter your vehicle info > suspension > caster/camber cam bolt kit. Sold individually, you need one per wheel...and you should eventually get a pair for the front to allow for better alignment capability down the line. They're $15/ea (shipped) when buying all 4 (i had to get them when I lowered the SS).

You can also find them locally at any parts store for just a bit more.