vacuum pump question

Vacuum pumps require a sealed crankcase pressure so you will not use breathers. The vacuum pump should have an adjuster/relief valve which allows you to dial in how much vacuum will be pulled. If you are getting oil in your pump then you may need to set up a better baffle system. I run a GZ pump on both my big block and small block on street. I pull the vacuum from valve covers and used the baffles that came with GZ set up.