2.8 intake manifold
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Junior Member
Joined: Oct 2006
Posts: 46
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From: sunbury PA
Car: 1986 pontiac firebird
Engine: 2.8l v-6
Transmission: 5-speed
Axle/Gears: stock
2.8 intake manifold
hey wanting to know if anyone knows anything i can do to make my intake flow better be it gringing or anything let me know and if your just gonna say the 2.8 is junk dont post cause i dont wanna hear it i like the motor it has over 200k on it and still going strong so dont tell me its junk but anyone else know any triks it would be much appreciated. thanks
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Joined: Jun 2006
Posts: 499
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From: Sherman, Tx - N. of Dallas
Car: Blue 89' RS
Engine: 5.7L
Transmission: 700r4
Axle/Gears: 3.42
Re: 2.8 intake manifold
be more specific please. the whole intake (lower, upper, and plenum)? or just the plenum? the plenum is the top piece that has the throttle body mounted on it. The upper intake is between the lower intake and the plenum. The lower intake mounts above the cam (on top of the block) between the heads.
So, if you are just wanting to do routine maintenance, take off the plenum, clean it with lots of carb cleaner (get a pack of 4-8 from walmart for $1.00 each)... just spray, wait a few secs, spray, etc. real easy and makes it a LOT cleaner.
you could also have a shop make you a custom one, or just make your's bigger... but you have to know what you are doing. IMO just carb clean it (it cleans carbon out of anything) and re-gasket it and toss it back on.
a WHOLE intake gasket kit (with valve covers gaskets) is ~18$ for Felpro... that's a good brand imo
So, if you are just wanting to do routine maintenance, take off the plenum, clean it with lots of carb cleaner (get a pack of 4-8 from walmart for $1.00 each)... just spray, wait a few secs, spray, etc. real easy and makes it a LOT cleaner.
you could also have a shop make you a custom one, or just make your's bigger... but you have to know what you are doing. IMO just carb clean it (it cleans carbon out of anything) and re-gasket it and toss it back on.
a WHOLE intake gasket kit (with valve covers gaskets) is ~18$ for Felpro... that's a good brand imo
Re: 2.8 intake manifold
u can gasket the upper to the mid section and gasket match the mid to the lower section.the only other reall thing u can do besides fabing up a whole new intake or top, is to grind the small side radius on the upper and mid sections, but u have to be carefull if u dont know what ur doing u can hurt flow alot more then u can help it
Supreme Member

Joined: Dec 2002
Posts: 2,564
Likes: 1
From: Central FL
Car: 91 Camaro
Engine: 3.1...not hardly stock
Transmission: 700r4....not stock either
Axle/Gears: 3.73
Re: 2.8 intake manifold
actually scottie, the top part is the upper. the middle "strip" of it, where its all open inside, is the plenum. then, the mid section and the lower that bolts to the heads.
I agree with Dave's post. and, he meant gasket *match*
I agree with Dave's post. and, he meant gasket *match*
Thread Starter
Junior Member
Joined: Oct 2006
Posts: 46
Likes: 0
From: sunbury PA
Car: 1986 pontiac firebird
Engine: 2.8l v-6
Transmission: 5-speed
Axle/Gears: stock
Re: 2.8 intake manifold
i have the felpro gasket set i got it awhile ago i just got enough free time to take the top half off i allready hit it with a can of carb cleaner i was just wonderin if anyone had any tricks they new of thanks
Re: 2.8 intake manifold
just the basic really. if u look at the next few pages in this section i posted pics of a stock v6 manifold in cutaway sections. take a look it will give u a good idea of what ur working with
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iTrader: (3)
Joined: Feb 2003
Posts: 2,470
Likes: 6
From: Waterford, MI
Car: 1998 Camaro Z28
Engine: 6.0L
Transmission: 4L60E
Axle/Gears: 3.73
Re: 2.8 intake manifold
ive got a few good pics on my cardomain site that shows pics of my intake before and after i ported spots on it. i also have flow numbers in a thread on here to show what i gained. nothing amazing but pretty good
Supreme Member
iTrader: (3)
Joined: Feb 2003
Posts: 2,470
Likes: 6
From: Waterford, MI
Car: 1998 Camaro Z28
Engine: 6.0L
Transmission: 4L60E
Axle/Gears: 3.73
Re: 2.8 intake manifold
its in my profile too, but here ya go
http://www.cardomain.com/ride/461596, its on the 3rd page
http://www.cardomain.com/ride/461596, its on the 3rd page
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