1990 240SX: Ran into an issue installing my crank (OEM rebuild)

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(posted from my build thread)

Alright guys, I'm in need of some serious help...

I have been working on putting everything back together (mostly getting the crank in) and I ran into a serious issue.

I torqued in all of the mains to 30 ft/lbs (full torque is 45-52) and I was going to spin the crank just to make sure that everything was moving smoothly. Note: I have not installed the pistons yet - just the crank. When I went to spin the crank it would not rotate. Now when I took everything apart the crank would spin smoothly with the old bearings in it and everything. However, now it would not spin anywhere close to "freely" - I had to put over 100 ft/lbs to get it to move.

So, please help me out. I ordered what I thought were standard main bearings from Advance Auto - I told them standard and the part number on the box indicates that it isn't oversized.

For reference the part is Sealed Power MFG# 7285M

It seems like the only reason the crank would resist this much would be if the bearings were oversized.

Any help with this issue is greatly appreciated!

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Does anybody know if Nissan would put in 0.50mm UNDERSIZED bearings in from the factory?

I ask because I just measured the bearing diameter (installed and tightened) and compared it to the crank journal diameter and had the following measurements:

Main Bearing = 59.62 mmCrank Journal = 60.1 mm

Going by this in order to get a clearance of .020mm - .046mm (factory spec) I would have to purchase .50mm undersized (or thinner than standard) bearings. That is if in fact I received the properly sized bearings in the first place - which I am unable to find out anyway of telling besides the packaging which has no indication of being oversized or under (and I ordered standard)