Some of you may already know of this but it's new to me. It a site called The GM Heritage Center. It's interesting reading and has downloadable information packages that are loaded with technical detalis.
http://www.gmheritagecenter.com/gm-heritage-archive/vehicle-information-kits.html
Mike.
It's great that GM has all this on line now! You used to have to write them and request it.
Great site thanks for sharing