I haven't been running a pcv valve on my street dual quad 440 because I don't want to suck oil into the intake. I've considered a catch can and a pcv valve. But I know different valves function differently and your best guess is to find the pcv that was used from the factory with a similar cam/set up. Great except most pcv are now 1 size fits all. Before I jump into a 130 dollar adjustable one I was looking for suggestions. What are you running for a set up?