Yep that'll happen. The black "stock" are real stiff they dont collapse. I think the intake sucks with more force then the PCV is blowing and therfore collapses the tube. There isnt as much pressure under the valve cover as there is being drawn into the intake/cyl chambers.
I dont know if you should keep the colord tube or not on the PCV, someone else will have to answer that. Put a fuel filter inline on that hose though to capture the oil that the pcv blows out and into your intake. (Poor Mans Catchcan)
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