I just reassembled my motor after a Hughes plenum swap and I seem to have an extra vacuum port on the drivers side of the intake. I know one is for the Brake Booster, and one goes to the vacuum junction above the valve cover on the drivers side. But for some reason there is another port and for the life of me, I cannot find a loose vacuum line anywhere. Not even a Cap! I notice the vacuum diagram for a 5.2 in the Haynes Manual only shows 2 ports on that side but the 5.9 has 3 ports. Mine is a Factory 5.2 truck, I know that is a fact, my father bought it new. What's the deal? Any one know, or help!?!?!

 

it should be capped, my 95 318 only has 2 used vac lines on the left side and 3 on the right...pain in my azz if you ask me

 

Yeah, that threw me off, I have 3 on each side. Is it possible the factory "accidentally" put a 5.9 intake on my 5.2?

 

mine has all 3 ports, one just has a black plastic/rubber cap, i'll take a picture tomorrow

what does the diagram on your core support show??

 

Right on, I think I read your post in the cb thread. I was worried you had both the antennas hooked up. Wiped the sweat when you said ones for show! Thanks for the come back though.

 

i used to have both hooked up but my SWRs were way outta whack when i put my uncles meter on it, there still not great, about 2:1, but i may have a piece of coax going bad (i routed it under the truck, and through the boot for the t/case

 

they are the same thing. i got a 5.2L manifold in my 5.9L

 

I understand they are the same, but the problem lies with the vacuum ports. 5.2 has 2 ports on the drivers side, and the 5.9 has 3 ports. The question is do I plug it or is it used?

 

Just plug it. You'll know soon enough if something didn't get connected to it. One of them is just a test port.

 

Yeah just plug it.