That's not how to plumb for PCV.

Fresh filtered air needs to enter the crankcase, either via a filtered oil cap, or hose to a carb filter base. The other side of the engine then needs a PCV plumbed to manifold vacuum.
On a Webered V8, these needs to be plumbed to ALL inlet runners, either via a spacer under each carb, or individual feeds drilled and tapped into each runner. I have mine plumbed under the manifold.

Gary

Gary, it doesn't need to be plumbed under "all" intake runners. That doesn't accomplish anything more that having it plumbed under ONE intake runner (at least for the purposes of meeting the regulation). All you need to to is provide a way to burn crankcase gasses via internal combustion, and provide filtered air to the crankcase in times of vacuum. You can (and I did) do that by tapping a spacer plate under a single weber, with a line going to the PCV in one valve cover. Then, you tap into the bottom of an enclosed air filter over the same, or any other carb, with a line going to the opposite valve cover (or the oil filler cap which may have a connection for just this purpose). This meets both the intent, and letter of the law. I had no problem passing with this setup.

Gary, I see that you're from Australia. You guys have all kinds of crazy regulation when it comes to cars. I assure you that the PCV only needs to be able to expel its gasses in such a way that they are combusted within the engine. One line into a common manifold...or any manifold (in the case of individual throttle bodies) will accomplish the task. I suppose one could argue about the effective vacuum not being consistent over a single cylinder, but the webers cover two cylinders, and I suppose the authorities think that's enough. At least here in the US of Kalifornia.

It is if that is all that is required to pass inspection.

What you describe is proper for the most reliable operation since it avoids dumping all of the blow-by into one cylinder. Which I assert is not a big deal anyway, and we can have the "catch can" discussion somewhere else.

However, reliable and most proper operation aren't necessarily all that is needed to pass inspection if the goal is to simply undo it when the inspection is complete.

I had the 8-stack EFI system (Roush 427IR) that had no PCV system. Colorado never required me to add it.

So when plumbed to only one cylinder, it may well have PCV operation at light throttle, but for the other 7 cylinders it will be blowby, either out a vented oil cap, or hose to atmosphere.

So any tech who passes PCV that is not sealed in one form or another, or not plumbed to a continuous vacuum source needs to look at the rules.

I would have thought that California would be tougher than Australia. ;)

Gary,

Not sure I'm understanding your point. The "blowby" is into the crankcase (yes, potentially from all cylinders), but is then vented into the intake so those same gases are consumed. It doesn't matter which cylinder combusts them, as long as they don't get vented to atmosphere. The only potential problem I can see at light throttle is if you don't create enough demand/vacuum in your intake to combust all of the gases being vented into the crankcase. If that's happening, you probably need to replace your rings.

BTW, give Kalifornia some time. I'm sure they'll find a way to eventually ban all ICE vehicles, eating beef, breathing oxygen and heterosexual behavior.

Cheers!