A high volume pump should not increase the pressure, How ever it will put more oil on the top part of the engine, thus leaving less in the oil pan for the pump to work with. When a customer wants a high volume pump, I use pipe cleaners in the push rods to cut the flow to the rocker arms. I have seen them fill the valve covers so that the valve stems was standing in oil. causing excessive oil consumption.
If you don't make mistakes. your not doing anything.
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