I had my motor installed with the L92/L76 combo. I am not making enough vaccuum for the ac to blow out of the top face vents. My installer told me it was a vaccuum issue. He wanted me to post on here to ask about the vaccuum lines. There is a line going from the firewall to the TB, he put a t in it originally and needs to know where it goes. Pretty much, a vaccuum scematic would be ideal, but if you could just tell me where the vaccuum lines go from the firewall on the L76 equipped cars it'd be appreciated. Thanks
Mitchell

 

Are you sure you have the correct line?

There is a small black vac line that was attached to the rear of the LSx intake on my '00 C5. I got some line adapters and plugged it into the rear of the L76 intake.

 

That line on the back of the intake may have a tab from the mold that must be broken off to attach the line to the heater/AC. At least that is the case on C5s.

 

its the same on f-bodys. its the vaccume for the vents.