Thank you Kurt. So just to recap:Good price on an SN.
So yeah, to the best of my recollection, having not had a stock intake on my car in almost 20 years, I'll try and recall the vacuum puzzle. The section of hose that you have sticking off the back of the intake goes to a T splice that connects to that screw in vacuum port on the far end of the intake that you have in the first picture, then goes to the PCV valve that is on the second picture. That PCV valve plugs into the back of the lower intake near the bottom. Just look at the very back near the transmission bellhousing at the center of the intake, and there is a hole there for it to plug into. The other vacuum port on the bottom of the intake is the main vacuum line that goes to the vacuum tree which is mounted to the inner fender right by the brake master cylinder. That supplys vacuum for stuff like the brakes, the HVAC, cruise control, etc.
Kurt
Now I see. Smaller diameter goes to the tree, the one with the hose goes to a “T” over to the large 90 degree fitting over to the PCV valve.Ok, so not quite. In the first picture, there is one nipple on the bottom of the intake that has almost no hose on it. That one goes to the vacuum tree attached to the fender. The other vacuum nipple on the bottom of the intake has quite a bit of hose still on it. That hose goes to a T at the back of the intake where that giant screw in piece is, and then continues on to the PCV valve. So it gets vacuum from both the bottom of the intake, and the back of the collection portion of the manifold to suck from the PCV valve. No clue why it's like that. I wouldn't put too much effort into it honestly. Make sure there is vacuum going to the tree, and vacuum going to the PCV valve. If you need to cap a nipple, just go ahead and do it. You are going to need an aftermarket manifold for your 347, and it won't be setup like that, so don't over think it. Obviously you will need new hoses. Just get bulk 3/8" fuel hose from the parts store for 78cents/ft or whatever. It will work fine.
Kurt
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