People remove the cam cover to intake pipe connection, as older cars have more blow by, and ingesting and burning these "already burnt oily gases" lowers the quality of the in cylinder combustion. The one way is there, so when on boost, pressurized air doesn't go back into the crank case. On the over run, or when you back off the accelerator and the revs are dropping, a small one way valve opens and suck the blow by from the crank case as well. The factory setup has a pipe from the cam cover to the intake pipe, then when under boost ingests the blow by, creates a little vacuum under the piston, increasing performance slightly. Having pressure from blow by below the piston, in the crankcase then lowers the pressure differential, decreasing performance and causing issues with blowing out seals, dip stick etc etc. Clearly engines work cus the pressure in the cylinder is higher above the piston then below is, so the piston moves down. When the cylinder charge burns, some gas leaks past the piston rings into the crankcase, that's called blow by. (tea through a tea bag into hot water, or water through your kidneys, 02 and C02 through aveoli in your lungs) or hot air from one room to another etc. So osmosis, or equalization of a concentration through a semi permeable membrane. Nature always tries to equalize, from one extreme to another, be it heat or particulates suspended in liquid. Not that i get off on qouting myself but.
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