[mattliston]

Did you clay the motor during assembly?

With a spun bearing problem in past, was the crank cut and polished? or did you only clean it up and use new bearings?

It is possible the crank is warped.

It is also possible (regarding high oil pressure) that the oil pumps relief is jammed shut and not releasing

 

[mattliston]

I only pick warp or bent, as its eaten another set of bearings in record time.

If its going to the machine shop, you can ask for the crank to be cut and polished so that you have all matching bearing tolerances.

That would be ideal, as then all 5 mains are getting the same oil pressure.

This assumes the block does not need a line bore. If the girdle matched the block, and nothing has ever been over-torqued, its an okay chance you dont need one. But if its reasonably priced, it wouldnt be a bad idea, if this engine is eventually going to see a lot of stress or heat

 

[mattliston]

Speaking of tolerances, no numbers have been posted.

If you blindly threw in a set of bearings, that is most likely the problem