excessive 340 crankcase pressure

On the race engine, we ran a PCV valve in both valve covers to eliminate high crankcase pressure at high RPMs. Just put a tee at the back of the intake/carb & plumb the second one in.
1: i'm curious about this as i've never heard of someone doing this before. 2: he's got a street car that's spending most of it's time at part throttle and i don't understand how that's going to do him any good