Not to rob this thread, but what's the story on these twist-in breathers with a vent tube only (no PCV)? What are you supposed to do with these exactly? Are you to run an "in-line" PCV valve between this vent tube and the carb, or can you simply hook a hose between the vent tube and the base of the carb, or is the vent tube supposed to just hook to the bottom of your air cleaner or something? I would think without some sort of check valve (PCV) the vaccuum would suck oil into the intake... just wondering, as my car currently has no PCV, just a breather on each side, and both are the twist in type, so without changing or modifying my valve covers, I can't really install a standard style PCV.