A PCV system will not put your crankcase under a negative pressure condition that I mentioned previous and help ring seal under racing conditions. An open vent to atmosphere would be an improvement over a pcv in a racing engine. You decide which applies to your engine. A PCV is not active at WOT, no vac to remove crankcase pressure from W.O.T. ring leakage. An open 3/8" tube to a crankcase is not an alternative for scavenger vents that are usually 5/8" per side to keep up with the venting need at WOT. Maybe Slowmotion could elaborate what they are attempting to fix by adding a PCV to his engine it may be interesting?