Re: lowest oil pressure for engine to survive
What you just said makes sense. The 80 or 50 lb is a maximum. When warm, running down the road or at idle you are nowhere near the blow off pressure of the valve, so beefing it up makes no difference.
Personally I'd leave both valves in place so the oil feed to the timing chain area is regulated properly. But that's just me and I've never had to do it.
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