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the last one with a cast 347 crank i saw with the main caps off (didnt break) in an early block had a lot of cap walk etching. i just think they are a time bomb. i would bet the block failed before the crank.
 

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Probably a million or so 302's were cast and put into vehicles, thousands upon thousands have been stroked to 347 and pictures of four or five busted stock blocks and its fact. I don't think so. I ran a 347 stock block with the 5.4 rod combination at the power level the op posted for seven years and 7K+ plus miles with zero issues and have seen many exceed that number hp wise.

i have had that didnt break as well. the last one i tore down with the same crank had a #### ton of cap walk, and it was an early block. i assure you that its only a matter of time when the caps are dancing.
 
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