The simple facts are - you can't predict how long one will hold up/when it will break. No two are identical - some hold up better/last longer. That's why they break when a lot more is asked of them than they were designed to handle - there's just not a lot of metal there to keep the crank/caps from moving around when stressed. The stock 8.2" block was lighter, cheaper - perfectly capable of standing up the 300 lb-ft of torque they were getting out of it and the 5000 rpm or so that was about the max revs most of them ever saw. The reason for the discrepancies is due to how much cast iron they took out of the 'thin wall casting' 8.2" block when they built it and how much more Dart puts into their cast iron version. And the aluminum 8.2" from Dart doesn't weigh much less than the stock 302 cast iron block. What you'll find is that the Dart block in the 8.2" size weighs almost as much as stock 351 block weighs. Do a bit of research - compare the block weight of the stock thin-walled casting to a Dart block to the Dart aluminum block.
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