The clearance is built into the piston. I don't think I have seen a case were this weren't true and I've worked on a lot of motors.
Generally you finish the cylinder at whatever oversize the piston is. When you mike the piston it should be the amount of the clearance smaller than this number. Sometimes I would take the cylinder over a little if I thought it needed it but I am talking like 1/2 to 1 thousandth.
I remember NXB's being 3.25 bore. I would bet the clearance is closer to 2 to 3 thousandths than 4 to 6. But I would have to mike the pistons to give you a better answer.
For what it is worth I have ran an engine machine shop for a few years until I burned out. I still overhaul motors for people.
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