I changed my valve cover venting from 2 –an8’s to a catch can with a single little filter. I was filling the catch can up with oil. From empty to overflowing in one pass! I added a HLA, plugged the vents in the valve cover and drilled a new hole in the back of the head for an –an16 fitting. The machining pictures are of my new stage 5 MAP head.
I built a new catch can with much more capacity and used 2 K&N 3’ filters.
Threaded Mode