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Originally Posted by Allnuts
I have a 347 with 6k miles on it with no problems. I guess it just depends who builds it, mine was built by Livernoise. 
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i built a 347 2years ago for my street car. with the same block you have ,,sportsman ,,ive got 62,000miles on it and is going strong.ive built many others with after market blocks no problems so far ..did a lot of stock blocks and everyone of them split down the middle ...almost bankrupted my ass