I, too, went to GMI in the early 70's
I worked at Pontiac in Pontiac MI. The sh** that went on back then was truly unbelievable, at least for this 18 year olds eyes
One of my duties was to crawl around in the rafters of the engine plant and count the number of blocks that had fallen off the conveyor system ... in black sand / dust environment, probably the equivalent of being in a coal mine ... so the "myth" that block HAD to be cast within a certain time period is only that, a myth. They would send up a newbie GMI student every year to get them counted and pulled down ...
I was never involved with the stamping process, but here is a Muncie we had last year that obviously had problems with the stamp, they finally gave up and stamped it 90 degrees from the "normal" area to the top of the case ...
http://www.camaros.net/forums/showthread.php?t=136529
