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LS1 vacuum port removal.

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Old 01-27-2009, 06:51 PM
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Default LS1 vacuum port removal.

Just wanted to know how to remove the vacuum port at the rear of my LS1 intake. It has two ports and the MAP sensor mounts to it. I have removed the sensor but don't know how to get the port out of the manifold. Thanks for your help.
Old 01-27-2009, 08:13 PM
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Originally Posted by radiowaves88
Just wanted to know how to remove the vacuum port at the rear of my LS1 intake. It has two ports and the MAP sensor mounts to it. I have removed the sensor but don't know how to get the port out of the manifold. Thanks for your help.
It's been awhile, but I *think* you push inwards to compress the seal and turn counterclockwise a quarter turn. See if that does it...

Russ
Old 01-27-2009, 08:34 PM
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Thanks, I'll give it a try.
Old 01-28-2009, 01:48 PM
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Nope, still can't get it out. Any other suggestions?
Old 01-28-2009, 07:49 PM
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Originally Posted by radiowaves88
Nope, still can't get it out. Any other suggestions?
My manifold was broken when I got it, but here's a good pic of it disassembled. I still think it was a quarter turn, maybe tight because of the o-ring?

Russ
Attached Thumbnails LS1 vacuum port removal.-p0002414.jpg  
Old 02-22-2009, 07:16 PM
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Does anyone know what the part number is for that piece? I broke mine and need to replace it. Any of you guys have a spare.
Old 02-22-2009, 09:43 PM
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That piece doesn't have it's own part number, it's included with the manifold assembly. I would look in the for sale section for a used LS1 intake, they are pretty cheap.
Old 12-02-2014, 11:47 AM
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As you can see in that picture, that guy broke his. That piece is NS(not-stocked, non-service) and is considered to be an integral part of the intake. If you look closely at that port piece, you'll notice it has multiple retention barbs/tangs. It is meant to snap into the manifold when pushed in. To remove that port, you have to have the Throttle body removed and then, using something long, strong and narrow, push the detent inwards while using your other hand to provide a "pulling outward" action on the port. Once one of the clips is pushed inward far enough, the pulling force of your hand should be able to pull that side out and then you can get the port out fully.

Last edited by mightyquickz28; 09-21-2017 at 11:30 PM.
Old 12-02-2014, 04:05 PM
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hahaha Mighty, didja see the date of the post you responded to?
Old 12-02-2014, 05:29 PM
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Yeah, it's ancient by internet standards. But I've been looking for references on what ports on the LS1 intake go to and I came across a couple that were misleading ("Twist it") and I just wanted to set the record straight in case someone else came across this post. NYC, eh? Nice to see!
I'm near Albany and putting together a 5.3 with PT7675 turbo, Wiseco Pistons, Callies Rods and Isky Triple 12 cam. Hope to have it all together by next Spring.

Originally Posted by Paul Bell
hahaha Mighty, didja see the date of the post you responded to?
Old 09-21-2017, 07:58 PM
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Default 1999 LS1 fixing in 2017

Originally Posted by Paul Bell
hahaha Mighty, didja see the date of the post you responded to?
im thankful there’s people who are not afraid to revive old posts. I searched for this because I am trying to get everything away from the oil pressure sender to replace and might leave this vacuum port alone it’s even a bugger to get the hose off I don’t want to break it.

this thread helped me a bit
Old 09-21-2017, 10:09 PM
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That's what it's here for. I've found it to be both helpful and hurtful at times.
Old 08-18-2021, 05:55 AM
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Agreed. Ancient thread that needs love.

This thread was first in google in my quest for knowledge and proved the most useful and relivent.

(Needed to give offering to tech gods)
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