[urq] lifter clatter

[DGraber460 at aol.com]

I just got the URQ running again with the newly rebuilt block (WX), and the  
big valve hydraulic head which was sitting for about 4 months is clattering  
annoyingly. The rings rods and mains are new so I don't want to rev it too 
high.  Oil pressure is good, and I'm using Rotella Synthetic 5-40.
Any secrets to getting them to "pump up"? I can't put it under load yet as  I 
have to bleed the brakes and clutch as well as a bunch of other fiddly bits 
to  wrap up.
If I have to take them out and soak them, I will just sit and cry for a  
while as my body is just not up to anymore of this.
TIA
 
Dennis
Denver
 
PS There is  no feeling quite like having a newly built engine fire on first  
attempt.
AFTER of  course cranking with no coil to get it oiled up.