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Intake plenum gasket?

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Old Oct 25, 2024 | 04:30 PM
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From: Boon docks.
Intake plenum gasket?

Has anyone used the cometic gasket for the intake plenums? Just did a set on an early 99 with the flat aluminum style plenums but only have about a month on them so far. Does anyone think it's a bad idea ?
 
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Old Oct 25, 2024 | 07:25 PM
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From: Tobyhanma, PA
If your plenums are in good shape those gaskets should work fine. But I see alot of folks mangling the plenums when removing, plus when scraping the old sealant off.
 
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Old Oct 25, 2024 | 09:58 PM
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From: Boon docks.
Originally Posted by Edgethis
If your plenums are in good shape those gaskets should work fine. But I see alot of folks mangling the plenums when removing, plus when scraping the old sealant off.

I don't know that I would trust a gasket with the stock plenums myself
 
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Old Oct 28, 2024 | 08:54 AM
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From: Bahstun
stock plenums need to be glued with Ford TA since the metal is too thin for the boost pressures with gasket


 
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Old Feb 18, 2025 | 12:30 PM
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What about using the cometic gasket when upgrading to 3” cnc fabrication plenums? What’s pros/cons of gasket over sealant
 
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Old Feb 18, 2025 | 02:31 PM
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From: Bahstun
When using TA, you have .050 or less of material (that is like glue) bonding the two pieces together to hold 30+ PSI of boost


IMO oring sealed before gasket sealed when dealing with pressure

RiffRaff makes oring sealed intake plenums

 
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Old Feb 18, 2025 | 03:03 PM
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From: Boon docks.
Originally Posted by budweiser-obs
What about using the cometic gasket when upgrading to 3” cnc fabrication plenums? What’s pros/cons of gasket over sealant
so I have a buddy that used the cometic gasket with the upgraded intake plenums. So far so good. We did it a little after i posted this forum. Still good
 
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Old Nov 12, 2025 | 01:53 PM
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Originally Posted by budweiser-obs
What about using the cometic gasket when upgrading to 3” cnc fabrication plenums? What’s pros/cons of gasket over sealant

still havent fpund a real answer.
 
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Old Nov 12, 2025 | 02:26 PM
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From: Bahstun
try a gasket and see

old post
https://www.ford-trucks.com/forums/1...m-gaskets.html

I know the Sealant will work.


snip
 

Last edited by knottyrope; Nov 12, 2025 at 02:55 PM.
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Old Nov 30, 2025 | 05:00 AM
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From: Boon docks.
Originally Posted by knottyrope
try a gasket and see

old post
https://www.ford-trucks.com/forums/1...m-gaskets.html

I know the Sealant will work.


snip
THEY PAIR THE PLENUMS WITH THE COMETIC GASKET NOW
 
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Old Dec 1, 2025 | 08:51 AM
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From: Bahstun
link for that?
 
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Old Dec 1, 2025 | 09:32 AM
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From: Boon docks.
Originally Posted by knottyrope
link for that?

I dont know how to do that. Its on cncfabs website. They have had good luck with it. Many others have also.
 
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Old Dec 1, 2025 | 06:25 PM
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Got curious.

https://cncfab.us/products/94-5-98-5...plenums-423004


the plenums come with RTV. You can buy the gaskets as well, but they come with rtv as the standard option
 
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Old Dec 1, 2025 | 08:23 PM
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From: Boon docks.
Originally Posted by 97-psd
Got curious.

https://cncfab.us/products/94-5-98-5...plenums-423004


the plenums come with RTV. You can buy the gaskets as well, but they come with rtv as the standard option
However youd like to word it. They both work
 
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Old Dec 1, 2025 | 09:25 PM
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From: knoxville, tn
Originally Posted by BenRod
However youd like to word it. They both work

you are correct. They will both work. I do think it is worth noting that RTV is their standard option, but you can upgrade and include the gaskets as your discretion. I would take that as an indication that the gaskets would do well.

with new billet plenums, you can probably use either one. With the thin stock plenums, I would probably lean towards the RTV. Either way, a clean mounting surface is crucial to making either one work.
 
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