Header gaskets
#2809753
08/17/20 01:22 PM
08/17/20 01:22 PM
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Joined: Mar 2003
Posts: 1,467 Martinsville, IN
cdwmotorsports
OP
pro stock
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OP
pro stock
Joined: Mar 2003
Posts: 1,467
Martinsville, IN
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What are you guys using? I currently have some copper gaskets but they leak. I have Hooker Fenderwell headers and 452 heads. With the Stealth Super Sniper install I want to get the exhaust leaks fixed prior to firing this thing up
Last edited by cdwmotorsports; 08/17/20 01:24 PM.
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Re: Header gaskets
[Re: DusterKid]
#2809800
08/17/20 03:18 PM
08/17/20 03:18 PM
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Joined: Mar 2003
Posts: 1,467 Martinsville, IN
cdwmotorsports
OP
pro stock
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OP
pro stock
Joined: Mar 2003
Posts: 1,467
Martinsville, IN
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I"ve had good luck with Jegs brand copper gaskets on my 360 and use Mr. Gasket ultra seal gaskets on my 440. I currently have copper gaskets and they are a joke, not sure the brand though
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Re: Header gaskets
[Re: cdwmotorsports]
#2809851
08/17/20 05:27 PM
08/17/20 05:27 PM
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Joined: Mar 2009
Posts: 2,470 Sydney,Australia
tex013
top fuel
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top fuel
Joined: Mar 2009
Posts: 2,470
Sydney,Australia
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i have a cometic type , as recommended with the Trickflow heads . Use a little skim orange exhaust silicon been ablle to reuse them several times . Best i have had
Tex
New best ET 10.259@129.65 . New best MPH 130.32 Finally fitted a solid cam, stepped it up a bit more 3690lbs through the mufflers New World block 3780lbs 10.278@130.80 . Wowser 10.253@130.24 footbraking from 1500rpm Power by Tex's Automotive
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Re: Header gaskets
[Re: Neil]
#2809926
08/17/20 08:43 PM
08/17/20 08:43 PM
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Joined: May 2016
Posts: 630 Ct
Wirenut
mopar
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mopar
Joined: May 2016
Posts: 630
Ct
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Re: Header gaskets
[Re: Neil]
#2809932
08/17/20 08:57 PM
08/17/20 08:57 PM
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Joined: Mar 2003
Posts: 1,467 Martinsville, IN
cdwmotorsports
OP
pro stock
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OP
pro stock
Joined: Mar 2003
Posts: 1,467
Martinsville, IN
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A thin smear of copper rtv on your copper gaskets and you should be good. Wire brush it off and apply new rtv if you need to take it apart.
Those copper gaskets don't crush at all from my experience. The ones I tried were hard as hell so they are either touching or not touching and not touching is leaking. This is what I'm experiencing too, I figured they'd be a softer copper to allow for them to crush.
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Re: Header gaskets
[Re: nss guy]
#2809933
08/17/20 08:59 PM
08/17/20 08:59 PM
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Joined: Mar 2003
Posts: 1,467 Martinsville, IN
cdwmotorsports
OP
pro stock
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OP
pro stock
Joined: Mar 2003
Posts: 1,467
Martinsville, IN
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How thick are the header flanges? Especially with long fenderwell headers Pretty thick, they are 20 year old Hooker Super Comps I'd say 3/8" without going and measuring them
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Re: Header gaskets
[Re: cdwmotorsports]
#2810026
08/18/20 01:55 AM
08/18/20 01:55 AM
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Joined: Nov 2004
Posts: 16,532 On the run…
BloFish
I Live Here
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I Live Here
Joined: Nov 2004
Posts: 16,532
On the run…
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FelPro has been good for me with aluminum heads.
It really doesn't matter whether you win or lose… as long as you look good doing it!
‘65 A100 ‘69 ‘Cuda ‘73 Vega GT ‘06 Mega Cab ‘14 Mercedes SLK
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Re: Header gaskets
[Re: SNK-EYZ]
#2810060
08/18/20 08:02 AM
08/18/20 08:02 AM
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Joined: Jan 2003
Posts: 13,385 Marion, South Carolina [><]
an8sec70cuda
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 13,385
Marion, South Carolina [><]
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Never had any luck w/ the copper or aluminum header gaskets. Just high temp silicone works good if you can easily apply it and pull the header straight onto the mating surface. On most big block stock body cars, you can't really do that. The tan colored Indy gaskets work real well, but they're for the big port heads. I've had good luck w/ the Fel-Pro gaskets and I have a set of Remflex gaskets on the way. Figured I'd give them a try since I've heard good things about them.
CHIP '70 hemicuda, 575" Hemi, 727, Dana 60 '69 road runner, 440-6, 18 spline 4 speed, Dana 60 '71 Demon, 340, low gear 904, 8.75 '73 Chrysler New Yorker, 440, 727, 8.75 '90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt '06 GMC 2500HD LBZ Duramax
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Re: Header gaskets
[Re: an8sec70cuda]
#2810072
08/18/20 08:32 AM
08/18/20 08:32 AM
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Joined: May 2019
Posts: 713 Lake Villa Il
INTMD8
super stock
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super stock
Joined: May 2019
Posts: 713
Lake Villa Il
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I agree with just a (thin smear) of silicone if we're talking a manifold or header with a machined flat flange.
I think Hooker has a ground down but -raised- weld bead at each port so not sure if that's flat enough or enough surface area.
69 Charger. 438ci Gen2 hemi. Flex fuel. Holley HP efi. 650rwhp @7250 510rwtq @5700
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Re: Header gaskets
[Re: jwb123]
#2810085
08/18/20 09:15 AM
08/18/20 09:15 AM
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Joined: May 2019
Posts: 713 Lake Villa Il
INTMD8
super stock
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super stock
Joined: May 2019
Posts: 713
Lake Villa Il
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If the flange is machined flat just a thin smear of rtv works. So thin it's not squishing out everywhere. I prefer Toyota black FIPG.
69 Charger. 438ci Gen2 hemi. Flex fuel. Holley HP efi. 650rwhp @7250 510rwtq @5700
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Re: Header gaskets
[Re: INTMD8]
#2810121
08/18/20 10:45 AM
08/18/20 10:45 AM
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Joined: Sep 2003
Posts: 19,589 north of coder
moparx
"Butt Crack Bob"
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"Butt Crack Bob"
Joined: Sep 2003
Posts: 19,589
north of coder
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no matter the header brand or gasket used, separate the end tubes from the center tubes [a hacksaw works] and drill one hole on each tube mating flange oversize. this allows for flexing due to heat, and ensures no leaks. this even works to seal cheapo brands with thin flanges. i stole this trick from mr. Pbody years ago.
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