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Message: <blockquote data-quote="Tico007" data-source="post: 24345" data-attributes="member: 7026"><p>One of the reasons behind using a PCV valve vs the orifice is the PCV valve prevents moisture buildup in the fresh air tube. The orifice allows bidirectional airflow so at certain times you could have blowby flowing out the fresh air tube. Maybe GM thinks that that’s OK, but anyonethat lives up north knows moisture in the fresh air tube is a big problem. Why a lot of people use the FC219. Anyways, I attached a video and some live data from a few minutes ago on the 2013 with 123K.</p></blockquote><p></p>