The large hole in the valve cover is for fresh air to enter via the air cleaner, so I'm guessing you won't be venting the crankcase that much through that hole, you may be putting oil mist in the carb, depending on the crankcase pressure.
Old Opel Guy is correct in that the air flow is in both directions on the large hose, I forgot about there not being a PVC valve in the plumbing like other cars. That's what happens when you get on the net at dark thirty, when I should have been horizontal between the sheets.
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