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it would be my opinion the block was and is a second off the line to correct the mistake it was re bored over .060 - being a production GM original not a Bo Ty it does not have Siamese cylinders and the case is not as thick as you might think - it is a tall deck .400 and the intake, exhaust manifolds , distributor, are special to it as well not a good choice if you are not up to date on what to do - jz
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