While I never like to get into the middle of a good whizzing contest (I am lying. I just make sure that I stay out of the way of the crossing streams!),
HRL hit the nail on the head, especially with these old blow-by prone engines. You need maximum crankcase evacuation at mid to full throttle. The downdraft tube provides that, while the PCV system does not.
This commode-like post has enlightened me about where the schmutz, which accumulates on that small maxi-pad inside of the air cleaner (newer vehicles than ours) comes from. I could never grasp why it would collect there given that the flow was supposed to go the other way. Now we know. Thank you "King"
Carl
