Vacuum Pump Opinion

ch1ll said

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there is already a vacuum created in the crankcase without a pump. The pump significantly increases vacuum and pulls the rings tight to the cylinder walls. I know the theory and how it works. If it is pulling oil off the crankshaft, it pulling it off the cylinder walls as well.

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How many inches of vacuum are we talking about, in your experience/opinion?
It would be difficult to pin wear on a vacuum pump with a race engine as I pulled mine apart every 3-4 years, it ran at 8 inches at peak. Crossing my fingers, 5 inches would be a benefit and keep the engine healthy