It's funny when I hear someone say "but they sorted it out by 1976 when they put sleeves in the aluminum block". GM never did that, you could buy aftermarket rebuilt ones that had them. The 1976 & 1977 engines were actually ok, but by then, the market had tanked because almost everyone had heard the awful story... true to form for GM, fool around fixing the problem until nobody's left to buy one. The engineering that went into them was actually quite interesting. The entire body was dunked in a cathodic primer tank (which didn't help, they rusted worse than the Titanic), they built special rail cars with sides that opened into ramps, drove a bunch up and lashed them down, then hinged the sides up. They were shipped on their noses, hence side terminal batteries and a host of other design features put in to cope with that. Ok, back to washers and dryers and dishwashers!