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Discussion Starter · #1 ·
I am swapping an ls2 and 4l70e in a '82 chevy c10 and I have three lines I'm not sure what they connect to. Looking for any info on them. Thanks in advance for any info.

This one comes off the top of the intake manifold and then goes down along the side, my guess would be it's a vacuum line, so if that's the case could I just cap it off?
Engine Auto part Motor vehicle Fuel line Automotive engine part


The second one is coming straight out the back of the intake manifold, with the red o-ring.
Engine Auto part Automotive engine part Fuel line Carburetor


And the third comes out of the valve cover, and in early models I've seen where it attaches to the throttle body, but I don't know where it connects with the ls2.
Auto part Engine Automotive engine part Fuel line Carburetor
 

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1. I think it went to the evap canister (whatever it's called lol) by the fuel tank

2. Brake booster

3. Air intake
 

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Discussion Starter · #3 ·
Oh yea I should have known the second one, but do know if the first one and third one can get plugged off? I want to run a 4 inch intake, almost like pcmforless, but custom for my truck, so I wonder what they do with the line.
 

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I don't know if they can be plugged or not. Hopefully one of the more knowledgeable members will chime in on that
 

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2006 Red Jewel AWD
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1. EVAP Purge port, just remove the fitting on the port and cap it. I actually drilled and tapped thatport and it now houses my IAT sensor.



2. Vacuum Feed to brake booster, self explanatory

3. This is the PCV feed from the stock air intake into the valve cover. Just put a small K&N breather on this port. You also have a port on the rear of the drivers side valve cover. Put the same breather on that port as well.
 
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