How to remove plenum?
Thread Starter
Junior Member
Joined: Mar 2009
Posts: 90
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From: Atlanta, Ga
Car: 1988 Trans Am GTA
Engine: 350 5.7
How to remove plenum?
I bought everything I need to polish it now I just need to take it off. It was a bit more complicated then I thought but I dont have a book to refer too. Can anyone help me?
Joined: Dec 2008
Posts: 2,540
Likes: 0
From: Norwalk, CA
Car: 91Z28
Engine: 5.7 ls1
Transmission: 4l60e
Axle/Gears: 3.42
Re: How to remove plenum?
You didn't take any pictures of it before you took it off or you still havent took in it off
Re: How to remove plenum?
but if you dont know how to remove a intake and being intimidated "maybe just a little" by it i wouldnt attempt to port it unless you are willing to buy a new one. again just my but good luck anyhow
Joined: Feb 2002
Posts: 3,462
Likes: 4
From: N. Illinois
Car: 92 GTA/ 00 TA
Engine: 383/350
Transmission: 700R4/T-56
Re: How to remove plenum?
Why not help the guy out instead of berating him?
8 bolts hold the plenum to the runners.
To make it easier to remove you should at least loosen up 1 set of runners.
6 bolts hold the runners to the manifold. 5 on the outside and 1 is hidden on top of the manifold under the plenum.
Remove all vacuum lines and electrical connections to the plenum.
It should lift right out. It might be stuck to the gaskets but don't worry. You'll have to replace them anyway.
8 bolts hold the plenum to the runners.
To make it easier to remove you should at least loosen up 1 set of runners.
6 bolts hold the runners to the manifold. 5 on the outside and 1 is hidden on top of the manifold under the plenum.
Remove all vacuum lines and electrical connections to the plenum.
It should lift right out. It might be stuck to the gaskets but don't worry. You'll have to replace them anyway.
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iTrader: (1)
Joined: Jun 2007
Posts: 318
Likes: 0
From: Halifax, N.S.
Car: 89 T/A
Engine: LB9
Transmission: W/C T-5
Axle/Gears: 10 bolt posi, 3.73 Richmond Gears
Re: How to remove plenum?
Why not help the guy out instead of berating him?
8 bolts hold the plenum to the runners.
To make it easier to remove you should at least loosen up 1 set of runners.
6 bolts hold the runners to the manifold. 5 on the outside and 1 is hidden on top of the manifold under the plenum.
Remove all vacuum lines and electrical connections to the plenum.
It should lift right out. It might be stuck to the gaskets but don't worry. You'll have to replace them anyway.
8 bolts hold the plenum to the runners.
To make it easier to remove you should at least loosen up 1 set of runners.
6 bolts hold the runners to the manifold. 5 on the outside and 1 is hidden on top of the manifold under the plenum.
Remove all vacuum lines and electrical connections to the plenum.
It should lift right out. It might be stuck to the gaskets but don't worry. You'll have to replace them anyway.
Thread Starter
Junior Member
Joined: Mar 2009
Posts: 90
Likes: 0
From: Atlanta, Ga
Car: 1988 Trans Am GTA
Engine: 350 5.7
Re: How to remove plenum?
Why not help the guy out instead of berating him?
8 bolts hold the plenum to the runners.
To make it easier to remove you should at least loosen up 1 set of runners.
6 bolts hold the runners to the manifold. 5 on the outside and 1 is hidden on top of the manifold under the plenum.
Remove all vacuum lines and electrical connections to the plenum.
It should lift right out. It might be stuck to the gaskets but don't worry. You'll have to replace them anyway.
8 bolts hold the plenum to the runners.
To make it easier to remove you should at least loosen up 1 set of runners.
6 bolts hold the runners to the manifold. 5 on the outside and 1 is hidden on top of the manifold under the plenum.
Remove all vacuum lines and electrical connections to the plenum.
It should lift right out. It might be stuck to the gaskets but don't worry. You'll have to replace them anyway.
Thanks everyone.
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Thread Starter
Junior Member
Joined: Mar 2009
Posts: 90
Likes: 0
From: Atlanta, Ga
Car: 1988 Trans Am GTA
Engine: 350 5.7
Re: How to remove plenum?
First I cleaned it as best I could. Then I sanded it down using 80 grit + sander, then 120 + sander, then 150 by hand, 200 by hand, 320 by hand, 400 by hand, 600 by hand, 800 by hand, 1000 by hand, cleaned again, eagle one polish, buff.
Joined: Dec 2008
Posts: 2,540
Likes: 0
From: Norwalk, CA
Car: 91Z28
Engine: 5.7 ls1
Transmission: 4l60e
Axle/Gears: 3.42
Re: How to remove plenum?
When it starts getting oxidized just get some very fine steel wool and go over it thats what i do to mine and it looks like you just polished it
Joined: Feb 2002
Posts: 3,462
Likes: 4
From: N. Illinois
Car: 92 GTA/ 00 TA
Engine: 383/350
Transmission: 700R4/T-56
Re: How to remove plenum?
very fine steel wool?
Mine's all polished up and i'm always looking for options on upkeep.
Where would I find such fine steel wool?
Mine's all polished up and i'm always looking for options on upkeep.
Where would I find such fine steel wool?
Joined: Dec 2008
Posts: 2,540
Likes: 0
From: Norwalk, CA
Car: 91Z28
Engine: 5.7 ls1
Transmission: 4l60e
Axle/Gears: 3.42
Re: How to remove plenum?
I am not sure i just do that with mine with the very fine steel wool here is a website some one else recommended this to me so i am doing it http://www3.towerhobbies.com/cgi-bin...&I=LXHZ80&P=FR
Joined: Feb 2002
Posts: 3,462
Likes: 4
From: N. Illinois
Car: 92 GTA/ 00 TA
Engine: 383/350
Transmission: 700R4/T-56
Re: How to remove plenum?
I have some of that from there. I use it on my planes. I'll try it on my driveshaft before trying it on my intake as a comparison with my other stuff.
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