[Old Henry]

OK, here's a simple test for someone to do that thinks that the vacuum in the air cleaner canister will draw air into the downdraft tube (on 8ba) or vent above the oil pan (on 59A-B). With the engine idling, hold a piece of tissue paper over either of those "intakes" and see if there is enough vacuum just to hold it in place. No? Air from the fan blowing it off? OK, try reving up the engine and see if you can get enough vacuum in the air cleaner canister to hold the tissue in place at the "intakes." Result? Report to us.

Then try it the other way. Engine idling, oil filler cap removed, and the tissue laying over the oil filler opening. Any sign of suction at idle? How about revved up? Hold onto the tissue so it doesn't get sucked into the filler tube! And that vacuum is just coming from the air that the fan is blowing past the outlet. Think what it would be at 60 mph!

Please report results of test/experiments. I have stock/original ventilation on my 59A-B so can't try it but am very curious.