Supposedly, there are some baffles and such on the PCV side designed to knock out the oils which reduces the need for one. I've the the Elite Engineering one in mine, but have not put any real miles yet on it (~150, with not a drop so far). I don't know if anyone else on the board has any experience with the LT1 without any forced induction.
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C7 Status:
1100 - 2/10/14
3000 - 2/12/14
TPW - 3/17/14
Born - 3/20/14
R8C - Pickup on 4/3/14!
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