Thermostat Housing Gasket

[John D.]

Re: Thermostat Housing Gasket

I use this 10105135 gasket on all '57 to '65 fuel injections top water outlet..John Hinckley recommended this gasket to us years ago.
I also resurface the water outlet using my machinist granite surface plate with abouto 120 grit sandpaper.
Never had a leak with this gasket. John

[John D.]

Re: Thermostat Housing Gasket

Summit Racing list the thermostat gaskets for $1.99 each https://www.summitracing.com/parts/nal-10105135

Gary,. I clicked on the link. Price $4.95 each
Meanwhile friends may I say forget about the cost. Nothing worse than having a leak using an original NOS brown gasket. John D.

[Gary C.]

Re: Thermostat Housing Gasket

JD,

You're correct, it's $4.99 today. That's a heck of a price increase in a week.

Gary
....

[Joe L.]

Re: Thermostat Housing Gasket

All------

If one has a real old asbestos type thermostat gasket, I recommend those be thrown away. Those can be EXCEEDING difficult to remove when the time comes. Plus, I have found that they seal problematically.

However, if one has a later fiber type gasket without the sealant ring, I think those can be used if one applies a thin, more-or-less even thickness ring of RTV (preferably Ultra Gray) and allows the RTV to cure for at least 24 hours before installation. I've never done this but if one has the old style gasket handy and doesn't have a 10105135, I think this would work fine

[Ray K.]

Re: Thermostat Housing Gasket

Purchased 2 of #10105135 gasket today at my local Chev dealer. Invoice shows a list price of $7.44 ( I think this is inflated from the true GM list price ) my cost was in the mid $4 range. This thermostat housing gasket was used on all Chevrolet engines V-8 engines from 1955 -1991 as well as most 6 cyl engines. One other exception of note being some H-D truck 348 / 409 engines which used dual thermostats.

Ray

[Joe L.]

Re: Thermostat Housing Gasket

Invoice shows a list price of $7.44 ( I think this is inflated from the true GM list price )

Ray

Ray------


It is. This dealer uses the "GM list price escalator" program.

[Anthony C.]

Re: Thermostat Housing Gasket

Does anyone know the # gasket for a 75 L48 also is the silicone needed when installing gasket thanks

[Joe L.]

Re: Thermostat Housing Gasket

Does anyone know the # gasket for a 75 L48 also is the silicone needed when installing gasket thanks

Anthony------

The 10105135 is the right one for your 1975. No sealer is necessary with this gasket.

[Joe L.]

Re: Thermostat Housing Gasket

Here's an interesting item. GM says that this was the thermostat seal used for 1964-65 Corvettes as well as most other 1964-65 Chevrolet models. It's made of rubber. 2.05" OD, 1.58" ID, and 0.09" in thickness. Discontinued without supersession 47 years ago in March, 1976.


DSCN4158.jpgDSCN4159.jpg

[Justin S.]

Re: Thermostat Housing Gasket

Joe,
Was there a recessed area in the housing for those years that this seal would reside? If not, it seems like it would be difficult to align it properly.

[Joe L.]

Re: Thermostat Housing Gasket

Joe,
Was there a recessed area in the housing for those years that this seal would reside? If not, it seems like it would be difficult to align it properly.

Justin------


No recessed area in the housing of any used during the period. However, there is a recessed area in all manifolds for seating of the thermostat flange. The above-referenced seal can be installed in this recess and the thermostat installed on top. The housing and gasket can then be installed and the seal will compress and allow the gasket to also be compressed. I've actually tried this and it does work as I described.

The thing I do not understand is what the purpose of the seal would be if the gasket is also installed. However, some much later model cars do use a rubber seal on the thermostat in conjunction with a conventional gasket.