Fred;

I certainly followed this thread with interest, but because I had little to add, never chimed in...(I'm thinking that any engine builder worth his salt, pro, not following the book so closely, or even amateur being very methodical, and who EVER has built a Volvo redblock before in his life, is surely not going to forget the Cam oiler...), so I always figured finding the issue would require a full teardown...

...so I am very happy for you, that you were able to resolve this without it! (problems with fresh engines are always a heartbreak!!)...I just wonder what the actual mechanism of the low pressure was...since the Earl's adapter and cooler plumbing is upstream of the oilsys and the location at which your pressure switch and gauge take-off points are, about the only explanation I can come up with is that the cooler associated stuff was a significant flow restriction...kinda counterproductive to having a cooler in the first place!...can you please investigate this adapter and cooler further (I just wonder if this is another case of chinashit strikes again??)...there is something more to be learned here!

Cheers