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I've been thinking about this issue too. Because of the compression I run I can't put it into the engine. I can tell that there is some oil vapor from the big vent hole especially at higher RPM so I need to do something. I'm currently modifying a cover that I intend to block the small hole and either tap the large one and install a 90 degree fitting or mount a flat plate type breather there.
 

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Just an idea on where to put the oil from the vapor. Come straight out of the large port to a Tee fitting. top of the Tee would be a breather and out the bottom would be a line bulkheaded back to the valve cover or some other return area. Maybe the block or upper pan to equalize pressures.
 
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