Which engine do they fit? Bearing clearances and the condition of the crankshaft have a lot more to do with oil pressure than a specific pump volume does. Are you experiencing low oil pressure? In 60+ years of doing professional engine work, I've seen exactly two oil pump failures, and very few worn out pumps. Those were usually caused by the pump ingesting metallic particles which scored the housings and damaged the gears. Pump volume is directly proportional to engine RPM.
Jerry

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