Originally Posted by cotbu

Changing the valve cover design isn't going to eliminate blow-by!

I think people don't understand the "crankcase vent", It's routed to the valve cover because the valve cover has provisions for evacuation. On the oem S14 valve cover, the oil that may come up from the crank case, will not make it to the intake like in the s13 config. The valve cover acts like and oil air separator, in the s14 and s13.4 configs.
So adding a catch can just insures there is no oil in the intake.




The valve cover is supposed to be low pressure (I know), but that's why the PVC blocks boost from entering the valve cover. So you could remove the pvc line from the intake manifold and route it to a sealed catch can and have it purge constantly. Will it be enough vacuum? IDK.