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I had a C7ME-A block once. It was a 390....and had thin cylinder walls. It had not been bored before and .030" would about take it to the limit on the thrust side of one cylinder.
It could be a 428 or a 390. Pop the freeze plugs out and look for a "428" mark on the outside cylinder wall. Does it have any weld marks on the rear of the block?
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