I'm not quite following here. Why does the block need honing? It's a brand new block, it should already be hone finished to 3.1875 inch. That's what the pistons are designed for, they should fit straight in. Clearance should only be about 1 thou, they'll be sloppy if the bores are honed out further.
If the bores need resizing for some reason, then it should definitely be done professionally as Lynn says. However I don't see why it would be necessary.
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One of the original Australian CMP hunters.
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