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Old 11-30-2007, 09:40 PM   #1
amanda11270
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Anyone install an exhaust manifold doughnut gasket?

Hey all, anyone ever have their exhaust leak at the manifolds to head pipe connection? They have those solid flares there, I do not believe there is supposed to be a gasket, but mine leaks slightly no matter what I do to it. The pipe was cut back further to make custom duals, and I dont want to have to remove it and cut and weld to straighten it as it is only a slight leak when revved, a tiny tick, not even noticeable at idle. But its been buggin me as I just put in a new engine and the truck runs perfect and I want it to sound perfect, anyone know what size that tubing is up there at the head pipe top to the manifolds, im gonna go to Napa and see if they can hook me up with a exhaust doughnut to slip in them. I tightened my manifold connections tight, but im afraid any tighter ill be snapping off manifold studs then ill be screwed and really makin some noise LOL. Almost forgot, its an 89 5.8L
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Old 11-30-2007, 10:01 PM   #2
dirtmerchant
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do the right thing, set up that pipe correctly instead of using a gasket that burns out
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Old 11-30-2007, 10:04 PM   #3
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Quote:
Originally Posted by amanda11270 View Post
Hey all, anyone ever have their exhaust leak at the manifolds to head pipe connection? They have those solid flares there, I do not believe there is supposed to be a gasket, but mine leaks slightly no matter what I do to it. The pipe was cut back further to make custom duals, and I dont want to have to remove it and cut and weld to straighten it as it is only a slight leak when revved, a tiny tick, not even noticeable at idle. But its been buggin me as I just put in a new engine and the truck runs perfect and I want it to sound perfect, anyone know what size that tubing is up there at the head pipe top to the manifolds, im gonna go to Napa and see if they can hook me up with a exhaust doughnut to slip in them. I tightened my manifold connections tight, but im afraid any tighter ill be snapping off manifold studs then ill be screwed and really makin some noise LOL. Almost forgot, its an 89 5.8L
Don't do it Amanda !

It's a Chevrolet stop gap measure. Real cars and trucks don't need that kind of GM band-aid !

On a 5.0 litre they are two inch flares;



I used these 2 1/4" ends;



on the first 5.0 litre I did and they wuz loose like you say, but they tightened up okay on the manifold ball (TG).

Tain't no problem now, as the ball ends on the PaceSetter shorties fit just fine now;



If you're worried about your manifold studs, use brass nuts like I do;



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Old 11-30-2007, 10:05 PM   #4
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I got the same problem with my rig, only I put shorty headers on and there's a little crack and it won't close no matter how tight I get it, I'm not too concerned at the moment, but it does get annoying. I haven't looked into a donut gasket, so i'd like to see what you find out.
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Old 11-30-2007, 10:07 PM   #5
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hey six, where'd you get those new flanges?? those would be perfect with my shorties!!
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Old 11-30-2007, 10:17 PM   #6
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hey six, where'd you get those new flanges?? those would be perfect with my shorties!!
Got em' at Canadian Tire ElJosho (less than $5.00 each IIRC)

but never fear, they said "made in USA" on em'. If you print off a pic and slap it down on the counter, any knuckle dragging Chev counterman can find you some.

There's piles better pics on my Lincoln Supermotors page as I did the same custom Y-pipe for my Town Car that I did for my Bronco;



When you think about it, all my Y-pipe consists of is two of those flanges, a Flowmaster scavenger "Y" and some bent pipes.

The Lincoln page is;

http://www.supermotors.net/vehicles/registry/9371

Rather proud of the Y-pipe we did on the Lincoln;



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Old 11-30-2007, 10:22 PM   #7
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dude thats some flippin awesome good work! my stock y-pipe with the dual cats sucks balls, I'm thinking of doing the same thing as you now.
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Old 11-30-2007, 10:32 PM   #8
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dude thats some flippin awesome good work! my stock y-pipe with the dual cats sucks balls, I'm thinking of doing the same thing as you now.
Thanks ElJosho

but my pipe bending buddy gets most of the credit for the great bends and welds.

Truth is a recently returned FSB member, WD-40, let me pattern my exhaust after his, on the old BBS forum. His pics helped us immensely.

The best recommendation I can give you is spring for some 3" header flanges (JC.Whitney, $3.09 each);



They really leave you free to unbolt and re-bolt stuff on later, anytime you want with just two 9/16" wrenches.



Broncos are so high you don't even have to jack em' up to crawl under and change exhaust components.

Conscientious environmentalist that I am, I even weld them flanges onto my cats, so they can be removed and "tested" between smog checks.



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Old 12-01-2007, 07:39 AM   #9
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I had some special flanges made up at a local muffler shop and replaced the stock y-pipe flanges. Mine were 2 1/4" as well.
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