Low pressure 401?

[Jesse <j2sax@xxxxxxxxx>]

SO, the freshly rebuilt 401 has great oil pressure
when it's started, and when it's got some RPM going.  
Once warmed up and at idle it has Zero pressure.  The
only thing this fellow did not do himself was the cam
bearings and that was my first thought.  

He swapped the timing cover with a known good engine
timing cover with the same result, so it's not the
pump or cover.  Any other ideas?

Do well, 

Jesse

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