TC Breather Flow Direction

[itsafatboy]

Just to make sure does air pump out of the breather holes on the heads ,

[Ohio HD]

If the motor is sealed up tight and the breather valves are working correctly, yes.

[smoserx1]

Next time you do an oil change leave your dipstick in when you remove the drain plug.  After a quick spurt the oil drain flow should choke down to a trickle.  Then remove the dipstick and it should drain freely.  That is a good test of your breather function if it behaves in this manner.