quote Originally posted by Storm2077: A 1984 Fiero SE L4 ... issues with the thermostat housing sealing to the block, took a special made rubber gasket.

Did you make or buy this gasket?
If bought, what was the source?

RockAuto shows listings for two of the ring type gasket.
In addition they show the full flange gasket which is almost useless when you need the ring type.
The circled area is usual point of failure because there is barely any seal there.





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

⚠️ 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.

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