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It has to do with bearing clearance. Check the FSM procedure on finding the right bearing, nissan offers 3 or 4 sizes for normal and another 4 for regrind - which aftermarket bearing makers don't.
If i remember correctly you need to add that number to the one on the crank and it gives the reference for the correct bearing. Same thing happens for engine block bearings. Check the FSM for the exact procedure.
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