How to install LS6 Intake Manifold Video
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Joined: Jun 2002
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From: Las Vegas, NV
I'm in the middle of the swap right now on my 99 Vette. I'm kind of confused about the small hose connection on the back of the manifold. All I see is a small tube sticking up in the back. I'm assuming the small rubber elbow on the back if the intake was connected to it, but I never disconnected it...the intake came right out after I took the small connector off and fished the brake booster hose through.
Does my description of this smaller hose sound correct? I'm concerned because there was an intake leak before I started this swap and I want to make everything right.
Great vids BlueKnight
Thanks
Does my description of this smaller hose sound correct? I'm concerned because there was an intake leak before I started this swap and I want to make everything right.
Great vids BlueKnight
Thanks
Predator thanks for the info. I found out that hose controls the HVAC blend vents. I am going to extend the hosing somehow to make it easier to hook up. I don't think it even reaches the elbow at the current place it sits which is why it wasn't hooked up before. I might steal a little piece off the top to run into the elbow, then run a rubber hose down to the remaining tube and rtv it.
I thought the foam pads were put there to absorb the water so overtime it will do its job to keep it away from the knock sensors. Take them out and water would prob get to them much faster
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"HVAC blend vents"
That's it! HVAC vent/ vacuum tube. I was trying to remember but had forgotten.
When I switched to an LS6 intake there were two outlets, one for the HVAC vent and the other one for the AIR system I believe. I had to cap one of the outlets.
That's it! HVAC vent/ vacuum tube. I was trying to remember but had forgotten.
When I switched to an LS6 intake there were two outlets, one for the HVAC vent and the other one for the AIR system I believe. I had to cap one of the outlets.
Last edited by Predator; Mar 12, 2010 at 06:29 AM.
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Maybe they were put there to to block water getting to the knock sensors by absorbing, but they actually pulled/wicked water into the intake, water that probably wouldn't have reached the knock sensors without the foam being there. All you have to do is read all the posts with people who have fried their knock sensors. Also, the TSB from GM recommends removing the foam, that's where I got it from. GM realized that the foam was a mistake.
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Maybe they were put there to to block water getting to the knock sensors by absorbing, but they actually pulled/wicked water into the intake, water that probably wouldn't have reached the knock sensors without the foam being there. All you have to do is read all the posts with people who have fried their knock sensors. Also, the TSB from GM recommends removing the foam, that's where I got it from. GM realized that the foam was a mistake.
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From: Las Vegas, NV
Good idea, but use red RTV, and make about a 1/2" high dam around each sensor, and make a slot or opening in the dam facing towards the firewall to let any water flow out. When the car accelerates it will pull any water out towards the firewall.
Last edited by Predator; Mar 12, 2010 at 06:26 AM.
The other bigger tube goes over to the brake booster canister.I took all of the ribs off of my intake and then smoothed it out with a finishing wheel. Looked great.
I'm glad you got it all done, feels good huh?
tomorrow, me and my friend are doing the LS6 intake swap and replacing the push rods. My question is, I don't think the LS6 mani has the hole for the line from the AIR or EGR thing, these 2 systems are not removed from my car. ummmm, what should I do? just leave the line open? will my check engine light come on?
The AIR injection goes into the lid... You can get a mini filter and it will run fine. As for EGR you will have to get the codes tuned out because, yes, it will throw a code... Ask me how I know...
yeah me and my buddy decided to wait on the intake swap until I get the gaskets to cover them up but we did mange to get those nasty pushrods changed, search, " Trans am being parked" thread to see the pic 
its worth it 
its worth it