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crank size at th rod thro

The standard crankshaft rod journals would be 1.9365 to 1.9375 in diameter. If your replacing bearings the current diameter of the rod journals needs to be the measured to see what bearing will work.
 
Why do you want to replace the bearing inserts... if there are no issues, and you are doing that as a "PM" thing, look at the back sides of the bearing shells.

Likely, they will be marked "STD", or with a "US" marking (undersized) .001", .002", .005", .010", .020", etc..

If you are doing a complete OH, or have low oil pressure or knock issues, you need to have the crank ground, and install matching inserts.
 
What Bob said is totally correct however if you have low oil pressure on this engine it has nothing to do with bearings. The oil pressure is only built from the ball and seat in the stem of the oil pump and resistance thru the oil filter.
On this engine you can have good oil pressure with all bearing being bad. You can also have very low oil pressure and all bearings can be good.
If you have low oil pressure the first place to look is the oil filter or oil filter housing center stem being gone. If you have engine knocks look at the bearings. If you have knocks standard bearing will not stop the knock because you will find the crankshaft journals will be out of round.
 
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