PKRWUD, a stock 5.0 can certainly produce 50psi. I realize there is a pressure safety valve, but it's set at a fixed pressure, not variable depending on rpm. It may be the case that his valve is stuck, but I have extreme doubts the factory oil pump has a prayer in hell of exceeding safety factors for the oil filter. How about the older 427 FE's? They featured very powerful oil pumps, with NO bypass in them. The bypass was in the block, set at 125psi. Running cold they could barely exceed 100psi. When warm, they made 60-80psi. The oil pressure rises with RPM. It doesn't stay constant, especially in an old engine with 170,000 miles of bearing wear.
It certainly could be possible that his valve is stuck, but if the result of that is 50psi of pressure at idle, I need to wedge mine shut as well.
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