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Hi,
I am considering a GMC RTS w/8v71 DD. It runs great, no smoke, (even after engine load), oil pressure good when running. However, oil pressure seems pretty low at idle, reading is only a couple of pounds. Just revving the engine by hand brings the pressure up nicely. Do I have a good reason to be concerned?
The old 2 cycle Detroit engines ran a direct drive for the oil pump. This directly affected the amount of oil pressure at different RPM's. The big problems that a lot of DD's had was leakage. We used to say that we'd put a pan under them at night and pour the oil back in in the morning. If the engine has any age on the overhaul at all, put a big catch pan under it when you park for any length of time.