Re: ? bout what Oil Pressure should be on \'91 350
If your oil pressure is stable, then it is fine. When the needle starts to fluctuate a bit, then watch out. If you have changed oil and filter regularly, and kept your truck in a good state of tune, then it should last you well beyond its current life span. I like to use synthetic oil, costs more, but is real slick stuff. Worth the cost if you want your engine to last longer. As for oil pressure, note that the cam manufacturers don't like high oil pressure, high volume pumps, or any kind of splash control such as windage trays. They say it can lead to pre-mature cam wear. Stock pressure has a lot going for it, including distributor/cam gear longevity.