I was recently inside my B23's bottom end to replace the oil pump, delivery tube and seal, and drill an oil return in the block. Upon closing it all up, I discovered that I was getting lower than expected oil pressure at idle, especially when hot. I have heard that the oil delivery tubes can vary widely in fit, and I suspect that the new tube I installed was not fully seating in the block. Installing it into the pump body, I felt a very positive engagement, but I never felt that on the block end.

Furthermore, the new tube I purchased from the dealer was crush bent, and generally looked to be of inferior build quality to the original I pulled out (mandrel bent, better alignment of tube ends.) I modified the retaining rings on the new tube with the JBWeld method described in the FAQ, and I have since done this to the original tube as well. I am going to open her up again tomorrow and most likely swap the original tube back in to see if it fits better.

Has anybody else experienced poor fit from a replacement tube, or had a problem similar to this?
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Speed Racer, '83 240 R, '93 940 OL1 (Manchester, CT)