How can I tell if my OB crankcase vent is working ok? Reason for my asking, it seems that my shark has recently started to exibit symptoms that may be related to high crankcase pressure. (ie oil leak at the distributor o-ring, small oil seep at pan gasket and dip stick had moved out slightly.)

I pulled the hose from the air box and noticed a small amount of oil vapor puffing out while the shark was running is this ok or should no vapor be emitted at all -- unless vacuum from manifold aplied.