Hey, another thing to consider here: just how does oil get into the air inside your engine in the first place? In all out high tech racing, part of the plan for oil control is to keep oil in the pan so it is available to be picked up by the pump. And you want it to be just oil, not a frothy oil/air comb. That's the reason they have dry sump systems, but let's not go there.
Anyway, the oil coming out of the main and rod bearings is being whipped around by the crank and rods. We've discussed the crank scraper, it strips a bunch of this "windage" off the crank and rod caps and drips the oil pack to the pan. So there went some of it. Next, in the case of the Opel idea of draining the head down the block and dumping it onto the crank, I don't like that one bit and you may recall how I changed that on mine. Then, upstairs, the timing chain must throw a bunch of oil up, especially as it goes around the corner (cam gear). So on my valve cover spacer, (which is really a baffle to keep some head oil from climbing the right side of the valve cover) I made it run real close to the timing chain to help strip some oil there. Better yet might be a little hood over the timing chain/cam gear to keep the oil from wanting to be pulled into the vent.
That's it. The valve cover is coming back off soon. We got work to do! Still got to perfect the valve timing anyway, I know it isn't quite right...