Vacuum Block on Top of Throttle Body

[Hot Air]

I noticed that the rear port on my vacuum block is larger that all the other ports and that it is used for the PCV valve. I also noticed that it gets vacuum from a different port on the throttle body. Does anyone know why that is?
Conrad

 

[boostingbuick]

So it does not transfer oil to the other curcuits.

 

[Hot Air]

Thanks. I was making it out to be much more technical than that...ported vacuum vs non-ported vacuum like on a carburetor.
Conrad

 

[bison]

I noticed that the rear port on my vacuum block is larger that all the other ports and that it is used for the PCV valve. I also noticed that it gets vacuum from a different port on the throttle body. Does anyone know why that is?
Conrad

It flows too much air and will weaken the vacuum signal on the other ports.

 

[Hot Air]

Thanks guys. I've learned a lot.
Conrad