Quote:
Originally Posted by zeke
Seems like it could increase the apparent blow-by. Exhaust gasses build up under the valve cover that would normally be sucked back in to the engine (due to the negative pressure generated by air flowing throught the intake manifold).
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Why would the exhaust gases build up under the valve cover? You have a hose from the valve cover to atmosphere. The gases are pushed out of the engine via pressure in the crankcase. They don't need the slight vacuum level in the intake to generate flow.