Starting this post because this has been an ongoing problem for years....

Most Auto Parts places sell you this gasket for the thermostat housing.
This full flange gasket is almost useless when you need the ring type.
The circled area is usual point of failure because there is barely any seal there.

The Ring type seems to no longer exist (discontinued?).
But there must be a good alternative.



The paper gasket shown is for the housing with a flat face.




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[This message has been edited by fierosound (edited 07-19-2022).]

The Ogre from another thread...

quote Originally posted by theogre: ⚠️ Warning: There are 2 T-stat housing for Fiero L4. Maybe more but Actually seen and have two types. Simple Three hole Gasket above are for old type w/ the flange is totally flat where meets engine. This type has thin sheet metal flange w/ edges rolled 90° "up." This Gasket Must Not be used w/ T-stat came w/ a "rubber" seal in Groove in the Flange. Later "update" version has thick flat stamp steel flange and use the "rubber" seal. I don't know exactly what year first came w/ it but If it is in 84--- Very Likely the whole engine was replace under warranty/recall. I don't think RA or any others have a seal for updated T-stat pipe. Example: FEL-PRO 35342 "O-ring" O-Ring Thickness (in) 0.1 O-Ring Outside Diameter (in) 1.725 O-Ring Inside Diameter (in) 1.5249 And maybe too thin even if others are correct. I had to make a gasket. Made of thick cork (⅛/0.125 inch I think. not digging it out to post now.) Permatex made for custom caskets to fill up most of the gap and coat w/ RTV and Wait a few of Days to cure completely before fill the system. This before "glueing" both sides. Yes, I know don't use RTV w/ nearly all gaskets. Problem is 2 fold... The Thick cork barely or don't compress and trying to fill big gap w/ RTV alone won't take 15+ PSI Coolant very long either. Between the 2 and allowing RTV to completely cure is been 6+ Years and still seals. RTV takes Hours to Days to cure. Curing Is Not Drying. Dry RTV w/o time to cure has cause huge problems to people using them.

[This message has been edited by fierosound (edited 09-18-2020).]

Maybe this is why we can't find a gasket.
Found this online regarding this PN for the thermostat housing I found in P22 Parts Book.




The P22 Parts Book lists a seal PN 3049485 for 84-85 Duke E/Z Fill Thermostat housing.
On eBay - https://www.ebay.com/p/656503295

[This message has been edited by fierosound (edited 08-16-2021).]

Dug thru old pic's... (2014 when fix mine w/ DIY "gasket.")

Here are both types w/ old "rubber" on update one...

Another angle of the update one...


If you have the old style one, many have bent flanges. Likely related to long hose pulling on it, worse if you have crap dog bone and/or motor/trans mounts.
If you bend it flat, only warps again for same reasons and likely easier as bending weaken it. Above old type was warped then flatten and didn't install for this reason.

Might find gm 10038440 ACDelco 15-80794 but is whole thing and cost ~ 30 - 40 often more.
Many claim has X old part but out of stock on page or at checkout.

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[This message has been edited by theogre (edited 09-18-2020).]

[This message has been edited by fierosound (edited 07-19-2022).]

[This message has been edited by theogre (edited 09-18-2020).]

[This message has been edited by fierosound (edited 09-25-2020).]

[This message has been edited by fierosound (edited 07-19-2022).]

[This message has been edited by theogre (edited 09-25-2020).]