I have high oil pressure in my 1989 350 mag now I know its an old motor with alot of hours so what should I check it runs at 75lbs when idling but then drops to about 40lbs when running...what should I check? I have a remote oil filter if that matters I am running 20 50 oil thanks
Harry

Is this a new problem.

I had the same thing happening with my oil psi and the engine had the wrong sensor on it. It was working in reverse.

Mechanical guage to see if readings are accurate.