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Author
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Topic: Gasket on exhaust??
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kewljay223
Gearhead Posts: 263
From: Long Beach, California
Registered: Sep 2002
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posted 01-14-2003 10:28 PM
   
my manual says not to use gasgets on the exhaust manifolds. but i hear people say to use them and i see them for sale at auto parts stores. so should i get some and put them on or no or does it matter?? once i find this info out, i can finally put my headers on and drop my engine in. i cant wait!! thanks.
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V8 Thumper
Gearhead Posts: 3603
From: Orange, Ca. United States of America
Registered: Dec 2001
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posted 01-14-2003 10:40 PM
Many late model applications don't use exhaust gaskets, but the flanges need to be planed to insure true (perfectly flat). What motor are you assembling? What headers? I've never had a failure with Mr. Gasket Ultra Seal header gaskets. None better  Note: Header bolts need to be re-torqued several times as the gaskets compress/settle. Keep snugging them down for the first few days. If you apply a thin bead of copper hi-temp silicone on both sides of those Ultra Seal gaskets, and as long as you keep the bolts torqued down, you'll never blow a header gasket again  ------------------
1965 GT coupe, 333ci aluminum headed/solid cammed stroker, four speed, 3.70:1 9" All Blue Oval, no blue bottle
http://mustangsandmore.50megs.com/V8Thumper.html
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kewljay223
Gearhead Posts: 263
From: Long Beach, California
Registered: Sep 2002
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posted 01-14-2003 11:12 PM
i have a 351 cleveland and i bought the headers of ebay from a guy who said they came off of his mustang. they dont say headman or hooker or anything like that though so im not sure what they are. stock? i dont know but they look really nice and fit great. just wonderin if i should use a gasket or not or if it really matters. what is the difference?
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GrabberBlue
Journeyman Posts: 27
From: Manor, Tx
Registered: Jan 2003
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posted 01-14-2003 11:16 PM
I would definely use gasket on headers. I would recommend using a good brand like feltpro.
New Guy
Sam
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Hell_Fish
Gearhead Posts: 680
From: Austin, TX.
Registered: May 2002
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posted 01-15-2003 08:53 AM
On headers you want a gasket. I just got fel-pro's for mine. A trick that was told to me is, install the gasket and headers and tighten down. Run the engine for a while, shut in off, and let it cool to the touch and re-tighten. Do this a couple times. Check it many times the first few days. After that check and tighten them down every time your under the hood(changing belts, plugs, oil, etc..)since your there anyways.
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Pierre
Gearhead Posts: 394
From: Near Paris, France
Registered: Apr 2002
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posted 01-15-2003 08:56 AM
If your headers are as bad as mine (in terms of flatness !), I recommend using Earl Performance (summit sells them), they use a aluminium frame that holds silicon made square gasket 1/8"+ thick. They are as soft as lead and will garanty you a perfect seal.
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SteveLaRiviere
Administrator Posts: 34763
From: Saco, Maine
Registered: May 99
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posted 01-15-2003 09:02 AM
Exhaust manifolds can sometimes be used without gaskets if the mating surfaces are perfect. Mechanics always use gaskets, though because come-backs sucks. But headers always need gaskets.------------------
'70 Mustang Mach 1 - '72 Mustang Sprint - '94 F-150 Please remember our sponsors,
Mustangs Plus, NPD, Osborn Reproductions, MyFordPerformance.com, and FordRamAir.com
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kewljay223
Gearhead Posts: 263
From: Long Beach, California
Registered: Sep 2002
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posted 01-15-2003 12:57 PM
ok then. that answers my question but now i have another. why do headers NEED a gasket like your all saying??
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kewljay223
Gearhead Posts: 263
From: Long Beach, California
Registered: Sep 2002
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posted 01-15-2003 01:01 PM
quote:
Originally posted by Pierre:
If your headers are as bad as mine (in terms of flatness !), I recommend using Earl Performance (summit sells them), they use a aluminium frame that holds silicon made square gasket 1/8"+ thick. They are as soft as lead and will garanty you a perfect seal.
thanks. ill try those just to make sure that i have a good seal. i dont want to be inhaling fumes as im cruzing. 
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SteveLaRiviere
Administrator Posts: 34763
From: Saco, Maine
Registered: May 99
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posted 01-15-2003 01:23 PM
quote:
Originally posted by kewljay223:
ok then. that answers my question but now i have another. why do headers NEED a gasket like your all saying??
A manifold is a thick chunk of cast iron that is pretty resistant to warping when heated. Headers' exhaust flanges are sheet steel which have a tendency to curl and warp when exposed to heat. Gaskets help to keep them sealed. ------------------
'70 Mustang Mach 1 - '72 Mustang Sprint - '94 F-150 Please remember our sponsors,
Mustangs Plus, NPD, Osborn Reproductions, MyFordPerformance.com, and FordRamAir.com
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kewljay223
Gearhead Posts: 263
From: Long Beach, California
Registered: Sep 2002
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posted 01-15-2003 10:26 PM
quote:
Originally posted by SteveLaRiviere:
A manifold is a thick chunk of cast iron that is pretty resistant to warping when heated. Headers' exhaust flanges are sheet steel which have a tendency to curl and warp when exposed to heat. Gaskets help to keep them sealed.
ok. thanks. that makes sense. woonder why i didnt think of that. 
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68 S-code GT
Gearhead Posts: 1175
From: Sayreville, NJ, US
Registered: Mar 2000
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posted 01-17-2003 01:44 PM
This works very well!
quote:
Originally posted by V8 Thumper:
If you apply a thin bead of copper hi-temp silicone on both sides of those Ultra Seal gaskets, and as long as you keep the bolts torqued down, you'll never blow a header gasket again
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kewljay223
Gearhead Posts: 263
From: Long Beach, California
Registered: Sep 2002
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posted 01-19-2003 02:25 AM
what would be the best torque for them?
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