a good pcv sys. has two parts the pcv uses manifold vacuum to create a negative pressure in the crankcase and remove blow by it has a metered orifice calibrated to eng. displacement the second part is commonly called a kv tube it goes to the air cleaner under heavy load and at w.o.t. there is no manifold vacuum but there is a low pressure inside the air cleaner this handles the crankcase pressure then any body has never done it before should hook up a vacuum gage temporally inside there car and drive around for a week or so you will learn a lot about eng. operation and kind of fun watching eng. load vs throttle setting ....ted