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Old Jan 13, 2015 | 03:16 PM
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Default best header gaskets

Have a 98 with a 408 stroker. Has aluminum 317 heads. Has a leak near a primary on passenger side. Want to replace this winter. Dont want this to be an issue in the future. Any recommendations on brand? Material to use? Car has off brand stainless headers. Thanks for any suggestions.
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Old Jan 13, 2015 | 03:42 PM
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Use these Percy's Seal 4 Good

http://www.summitracing.com/parts/ph...FatcMgod7xQAxQ

Made from multi-layered "dead soft" aluminum, these Seal-4-Good gaskets conform to the headers for the ultimate seal. These gaskets are virtually blowout and burnout-proof and are also totally reusable.

Last edited by StrangelovesM6Vert; Jan 13, 2015 at 03:44 PM.
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Old Jan 13, 2015 | 03:43 PM
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I have always used and never had an issue with the GM gaskets. How thick is the header flange? Is is flat?
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Old Jan 13, 2015 | 03:43 PM
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I have always used the stock GM gaskets and have never had a leak.
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Old Jan 13, 2015 | 03:55 PM
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How long have they been on?
When they were installed did you tighten from center out, ~11FP the first run, then ~18FP 2nd time around?
If they are leaking prematurely, hopefully you don't have a warped flange. If so, take to a machine shop and have them lightly skim the flange.
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Old Jan 13, 2015 | 08:31 PM
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Originally Posted by vettenuts
I have always used and never had an issue with the GM gaskets. How thick is the header flange? Is is flat?
Originally Posted by 7LitreC5
I have always used the stock GM gaskets and have never had a leak.
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Old Jan 13, 2015 | 10:53 PM
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Originally Posted by grantv
How long have they been on?
When they were installed did you tighten from center out, ~11FP the first run, then ~18FP 2nd time around?
If they are leaking prematurely, hopefully you don't have a warped flange. If so, take to a machine shop and have them lightly skim the flange.
All work was done prior to me purchasing car, which I did on here. I know assumptions are bad, but I think it was done right. A supporting vendor on here did most of the work and it all seems to be top notch. This is a nitrous car and it saw some track time before I purchased. It had a small tick when I got it and it just got to the point this summer to where it is annoying now.
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Old Jan 14, 2015 | 12:17 AM
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I used remflex gaskets on my warped-as-hell xspower headers. No way would a GM gasket seal those things.
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Old Jan 14, 2015 | 12:29 AM
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another vote for factory gm gaskets
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Old Jan 14, 2015 | 02:37 AM
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GM, no leaks with same gaskets for 6 years
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Old Jan 14, 2015 | 10:36 AM
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Originally Posted by vettenuts
I have always used and never had an issue with the GM gaskets. How thick is the header flange? Is is flat?
Originally Posted by 7LitreC5
I have always used the stock GM gaskets and have never had a leak.
Originally Posted by neutron82
another vote for factory gm gaskets
Originally Posted by C5Natie
GM, no leaks with same gaskets for 6 years

Do you all have long tube headers?
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Old Jan 14, 2015 | 10:39 AM
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Yes. I have had 3 diffrent sets of headers on my car over the years and have always used stock GM gaskets. Never had a leak.

Originally Posted by John4cam
Do you all have long tube headers?
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Old Jan 14, 2015 | 10:40 AM
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Originally Posted by John4cam
Do you all have long tube headers?
yes I do
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Old Jan 14, 2015 | 11:18 AM
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Thanks guys.
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Old Jan 14, 2015 | 02:33 PM
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Yup, Texas Speed 1 3/4 long tubes
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Old Jan 15, 2015 | 01:53 AM
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Originally Posted by John4cam
Do you all have long tube headers?
Yup. Kooks 1 ⅞".
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Old Jan 15, 2015 | 08:20 AM
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Default Header Gaskets

Originally Posted by John4cam
Have a 98 with a 408 stroker. Has aluminum 317 heads. Has a leak near a primary on passenger side. Want to replace this winter. Dont want this to be an issue in the future. Any recommendations on brand? Material to use? Car has off brand stainless headers. Thanks for any suggestions.
Hello John,

Personally, I like Mr. Gasket. They're made with solid copper and I've installed them on Chevys and Fords with no problems.

Paul
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Old Jan 15, 2015 | 01:50 PM
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Gm gaskets here since 2005 with headers, and no leaks or issues. I have even had the headers off and reused them.
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Old Jan 15, 2015 | 02:38 PM
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I appreciate all the feedback. Now for the next question. If I order gaskets should I go with stock 98 corvette? I would assume since all research I've done says the 317 heads are round port also....
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Old Jan 15, 2015 | 02:40 PM
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In the past I have always used stock GM f-body gaskets.

Originally Posted by John4cam
I appreciate all the feedback. Now for the next question. If I order gaskets should I go with stock 98 corvette? I would assume since all research I've done says the 317 heads are round port also....
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