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Message: <blockquote data-quote="RossA81" data-source="post: 1579532" data-attributes="member: 10984">Did some experimenting today- 1) Completely closed/stock style system- drilled an oil cap and put a fitting in it, then ran 3/8 hose to a fitting in the blower inlet tube (mimic stock setup)  It seemed ok initially but later it refused to idle down and it had some crankcase pressure(air coming out dipstick tube)2) PCV hooked up, and open breather on fill tube.  Seemed ok- but surging and did not want to idle likely due to the large vacuum leak.3) Returned the car to the way it was when I bought it... PCV hooked up, and oil fill tube packed tight with rolled red scotch brite pads and an open K&N breather.   Seemed to run best this way- I assume it ran best this way because the shop that built it and did this tuned the car around this... Basically tuned to idle with a slight vacuum leak??    No crankcase pressure issues here.Note- the setup that was making the PCV noise/ crankcase pressure was the PCV hooked up, and an open breather with a check ball on the oil fill.  I would be fine with running deleted PCV and catch cans but I think it will need tuned to idle that way... Ross</blockquote>