I used a standard PCV valve and rubber grommet, allthough the PCV valve has to go in upside down it still is not blocked by the little thing inside of it. I made sure before the install that plenty of air can still get through. I don't see in any way that the oil can come close to getting up to the filter, besides it will fall back into the engine through the valve cover 1st. Also if you'll notice, I have the original catch can installed and should not allow anything to get by there before getting to the Tee to the valve cover.
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