25 to 30 psi would be quite sufficient. My old 304 would push 60 psi cold, but I worried about blowing out the oil filter seal. But many of today's engines reqire a very thin oil like 5-20. So if you are using a thin oil, you can expect a lower oil pressure. Those IH engines used to call for straight weight 30 for summer use, but in today's oils, I'd be using a diesel rated 15-40. This is a flat tappet engine with hydraulic lifters, and it needed a good zinc additive to protect the cam and lifters.
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