JEGS 52210 - JEGS Crankcase Evacuation Kit
it takes the cost and complexity out of it. if you could weld it could be put in for less than $50 or so. even if you cant, it probably would come in at under $100
exhaust crankcase evacuation....it works - Corvette Forum
according to this thread they say it works best under 4500rpm but it seams that they think that bigger motors cause it to be less effective.
people have thrown down c-notes on less proven things...