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if you notice, the valve cover has a nipple coming off the driver side of it with a hose that either goes to the intake piping or the intake plenum itself, depending on which engine you have ...
oil can go right through there, called blow-by ... happens with turbo cars, so they employ a catch can between the line - the cars are setup this way from the factory
a lot of oil coming through will indicate a problem, not with the intake, but on the engine-side of the equation ... a small amount is probably nothing to worry about
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