[Gunner]

OTOH, it's not like engines produce a ton of vapor in the crankcase. The difference between no ventilation and minimal assisted ventilation is probably many times that of any "more efficient" system. By letting the PCV pull gently at the internal fumes, I'd bet that some very large proportion of the water vapor is removed.

Now that I look, I see where I can very easily plumb the PCV valve in place of the rear breather and a vented filler cap to the air cleaner, with hardly any permanent modifications. The carb does indeed have a PCV port as well - so I have a nice, easy way to accomplish the job and then see if BAR agrees...