This link takes you to a huge compilation of GM information directly from GM. Lots of specs and technical data. https://www.gmheritagecenter.com/gm-heritage-archive/vehicle-information-kits.html
Here is the other thread for GM HERITAGE, which was posted yesterday, 10-15-2016. GM HERITAGE has been in Sterling Heights for many years, read the other thread for more info. http://www.jalopyjournal.com/forum/threads/gm-tech-center-data-dump.1036414/