I can't believe how lucky I am. I took the old tired motor out of my '72 and delivered it to the machine shop yesterday, and the guy identified it as and LT-1! Now we're trying to figure out how an LT-1 got into a '72 Blazer. The current theory is the factory must have run low on the standard 350 motors and to meet production needs they put in the LT-1. Does anybody think that is possible? Has anybody else run across a similar sitiation?