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Jerome is correct. Here is how the LT1 Camaro engines PCV system works:
Filtered fresh air enters the valve covers from the connection located in the inner radius of the main intake air coupler and as this is downstream of the MAF is "Metered" by the MAF so short term fuel trims are accurate as all of this eventually becomes part of the intake air charge. From the main intake air bridge assy. it flows into the center of the factory cleanside separator before splitting and entering both valve covers. This is referred to the "clean"or "Fresh" (as GM refers to it). This incoming fresh filtered air is what flushes and makes up for the "dirty" or "foul" (GM's term) vapors being evacuated (sucked out) the valley cover PCV barb. This is then drawn into the intake manifold by the vacuum present when at idle, deceleration, and light cruise.
The factory Cleanside does a pretty good job, best yet for GM as far as when you accelerate or go WOT and vacuum is no longer present to maintain evacuation, pressure builds and the foul/dirty vapors then back-flow out the valve covers and into the factory CSS. What we do to enhance evacuation is add a secondary evacuation suction source to the system that takes over and continues evacuation at all operating modes so pressure can never build in the first place. This full time evacuation removes the contaminants keeping oil clean longer as well as preventing up to 75% plus of the intake valve coking.
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