Originally Posted by CorneliusRox
Dont even bother running a catch can. Just vent them all to air, or if you really want to run a catch can, run check valves, and either two or them in opposite directions (to actually catch most of the junk based on vacuum or boost), or a separator plate style one.
I am just going to vent to air personally though as my direct injection doesnt allow fuel to clean my valves when the PCV crap coats them...
This is TERRIBLE advice. Run the unbaffled head vents through the hardline to the smaller PCV as with a stock engine, then run the baffled head vents and PCV to the catch can.