I had a Buick Roadmonster with the analog cluster...the 5.7L ran at nearly zero pressure at hot idle, but it had to be really hot out. I was under the impression that the SBC runs at fairly low oil pressure anyway. Turns out the car was getting too hot, due to a bad fan clutch, once that was changed, it had SOME pressure at idle. I don't remember the exact numbers, I sold it a year ago. I tried 10w40 oil too, that helped a bit, but I think the car ran better on 10w30. I must confess, I was really thrown by a 5.7L engine using a small oil filter, and only holding something like 4.5 quarts of oil. Not exactly the German way of doing things...

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2002 Ford ZX2
2 x 2013 Honda Civics