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Hi Tom, I had an old friend who was a wrench back in the 40s . He added a shim to the spring in my 36 dodge because after the complete rebuild I still had low oil pressure. If I remember right it was simply a washer , nothing more. He said the spring has to be able to compress distance of the diameter of the oil passage feeding it at the very least but should never need to be that tight. That washer he put in my Dodge took me from 20 psi to over 40 psi. Old school lessons from the one that lived them . Tim