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To the original question; an oil pump pumps oil through clearances in certain places and creates oil pressure. A high volume pump does not pump a single milliliter more oil with a certain oil pressure than a regular pump. If it pumps more oil, the pressure will raise.

Not 100 percent correct. The larger gears in the HV pump can move 25 percent more oil at the same pressure. Below is a descrpition of the Mopar perf HV pump from Jegs.If your oil pressure is only getting to 55 lbs then your bearing clearences/lifter bore clearences are out to lunch and a pump pressure spring won't help. My Dart Idles 60 hot and has 80 PSI at full boogie with straight 40 wt Redline.

Oil pump discription

"These high-performance, high-output oil pump assemblies will help protect the life of your muscle car engine, providing a 25% increase in oil volume over stock pumps. Pumps come fully assembled for easy installation."