The side port on my valve cover is vented to atmosphere via little k&n filter.I modified the underneath of the valve cover to also vent to the catch can via the back 2 ports. I drilled out the inside baffle tray, attached a "link" from the 2 back -10an fittings between the inner valve cover wall hole and baffle tray "wall" (which i drilled 2 holes into this wall) and then rewelded the baffle tray back in place. Basically my rear vents act as the same as the vent on the side of the valve cover.

Hard to explain but it works good. Any ventilation i can get will save my rings once push more then 600whp+.

this is how i got mine set up


I can't seem to find the link/picture/discussion on k20a regarding the 2 ports being welded on the block to vent the crank case. *shrugs*