Darrell, Hmm, I'm not sure about this, I haven't heard about it before but I guess it's theoretically possible. What you are suggesting is that there is increased pressure in the crankcase from blowby, then during the induction stroke the pressure above the piston will be lower than that in the crankcase, so some of the oily air will be sucked past the piston rings into the combustion chamber and will burn (probably not very completely) along with the petrol. To be honest, I doubt the amount of oil that would get into the cylinders this way could cause a significant smoke out the tail pipe. Only a very small amount of gas needs to escape past the piston rings to build up crankcase pressure, you'd need a lot more gas going the other way for any significant amount of oil to get into the combustion chamber. More oil would get into the combustion chambers simply by the vent pipe from the valve cover being properly connected to the carbs, and that doesn't cause smoking. But I'm going on instinct here more than personal experience or empirical measurements.
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