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  Gasket on exhaust??

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Author Topic:   Gasket on exhaust??
kewljay223
Gearhead

Posts: 263
From: Long Beach, California
Registered: Sep 2002

posted 01-14-2003 10:28 PM     Click Here to See the Profile for kewljay223   Click Here to Email kewljay223     Edit/Delete Message   Reply w/Quote
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

posted 01-14-2003 10:40 PM     Click Here to See the Profile for V8 Thumper   Click Here to Email V8 Thumper     Edit/Delete Message   Reply w/Quote
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"

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kewljay223
Gearhead

Posts: 263
From: Long Beach, California
Registered: Sep 2002

posted 01-14-2003 11:12 PM     Click Here to See the Profile for kewljay223   Click Here to Email kewljay223     Edit/Delete Message   Reply w/Quote
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

posted 01-14-2003 11:16 PM     Click Here to See the Profile for GrabberBlue   Click Here to Email GrabberBlue     Edit/Delete Message   Reply w/Quote
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

posted 01-15-2003 08:53 AM     Click Here to See the Profile for Hell_Fish   Click Here to Email Hell_Fish     Edit/Delete Message   Reply w/Quote
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

posted 01-15-2003 08:56 AM     Click Here to See the Profile for Pierre   Click Here to Email Pierre     Edit/Delete Message   Reply w/Quote
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

posted 01-15-2003 09:02 AM     Click Here to See the Profile for SteveLaRiviere   Click Here to Email SteveLaRiviere     Edit/Delete Message   Reply w/Quote
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.

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'70 Mustang Mach 1 - '72 Mustang Sprint - '94 F-150

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kewljay223
Gearhead

Posts: 263
From: Long Beach, California
Registered: Sep 2002

posted 01-15-2003 12:57 PM     Click Here to See the Profile for kewljay223   Click Here to Email kewljay223     Edit/Delete Message   Reply w/Quote
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

posted 01-15-2003 01:01 PM     Click Here to See the Profile for kewljay223   Click Here to Email kewljay223     Edit/Delete Message   Reply w/Quote
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

posted 01-15-2003 01:23 PM     Click Here to See the Profile for SteveLaRiviere   Click Here to Email SteveLaRiviere     Edit/Delete Message   Reply w/Quote
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

posted 01-15-2003 10:26 PM     Click Here to See the Profile for kewljay223   Click Here to Email kewljay223     Edit/Delete Message   Reply w/Quote
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

posted 01-17-2003 01:44 PM     Click Here to See the Profile for 68 S-code GT   Click Here to Email 68 S-code GT     Edit/Delete Message   Reply w/Quote
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

posted 01-19-2003 02:25 AM     Click Here to See the Profile for kewljay223   Click Here to Email kewljay223     Edit/Delete Message   Reply w/Quote
what would be the best torque for them?

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