The shop I currently use, and the one I used before they closed, both would take my blocks and bore them to just under a size. Like .0075, or .018, that way we would know how much it needed, then order the piston, and finish the bore. That way, they could still cut and fit. I preferred this because, before, we might think .010 would get it, and it wouldn't. I agree, piston in hand before the bore is finished, and I ALWAYS check skirt clearance. Even if my shop tells me it's good. I usually double check my crankshaft journals too. Only had 1 crank that had a mistake, but it would have cost the motor had I not caught it.
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