Advance and transfer slots

More BS.
A Wagner PCV is NOT the only way to tune your engine.
The factory PCVs flow a small amount of air at idle [ equivalent to a 1/8" round hole ]. Working properly [ ie enough engine vacuum to pull in the pintle inside the PCV ], this amount of air is drawn into the engine. When vac drops [ throttle blades opened ], the pintle unseats & lets in additional air.
I have tuned countless low vacuum engines just using a 3/8" ferrule [ 1/8" hole through it ] shoved into the PCV hose. I have done two this week. Just make sure your engine has a breather.