vaccum hoses

stangbanger67

Registered User
I'm just finishing up a headgasket job on my 89 XR7. I've got 2 vaccum ports that I'm not sure about. One is on the back side of the intake plenum between the TB and the SC. The other is just before the intake manifold after the by-pass valve. Do these connect together? It just doesn't make sense to me. Whats the purpose of bleeding off boost pressure back into the intake plenum??:confused:
 
There is definately a hose (cross talk tube or some ****) that connects between the blower inlet plenum and the intake manifold adapter. It's a fairly large rubber vaccum hose.
 
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