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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Today's Featured Article - History of the Nuffield Tractor - by Anthony West. The Nuffield tractor story started in early 1945. The British government still reeling from the effects of the war on the economy, approached the Nuffield organization to see if they would design and build an "ALL NEW" British built wheeled tractor, suitable for both British and world farming.
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