Ours is 29 inches...the height and weight restrictions are on the warning stickers on the seat. I think they changed by a bit between the 08 and 09 "models".
Which car seat? We have a Snugride from 2007 and it's 29". The sticker on the carseat should have the height and weight limits. Or you could go to the Graco website and lookup your carseat and it will have the height limit for your specific seat (if they're still selling it).
Re: graco infant seat height limit?