January 2016 issue of "Muscle Machines" magazine (#149) has an article on the PVC starting on page 64.
Its good!
It also has something someone here might want. The M/E Wagner adjustable PCV. It is also rebuildable so you would never need to buy a new one again.
www.mewagner.com
Its a little spendy but might be good for fine tuning the system to work.
http://mewagner.com/wp-content/uploa...ay-3-views.jpg