Hey Kurt,
The Norwood closure along with the 10 other plants closed in conjunction with the global restructuring of GM under Roger Smith is incredibly well documented.
If the 1972 strike had anything to do with it closing, why in the world would GM have pumped 270 Million into modernizing the plant in 1981-1982 for the gen three car-- I mean a new Flat plant built at that time was only about 40 million more in cash outlay.
Let me know and I will be glad to send you a free copy of the book "Echoes of Norwood".