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stoney 81ta 07-24-2010 09:04 PM

type of gasket sealer to use
what type of gasket sealer to use when installing a thermosat housing,does color matter all i have is the red high heat sealer.

Greg T 07-24-2010 09:49 PM

I just use the spray "High Tack" stuff from Permatex.

hemi joe 07-24-2010 10:10 PM

if you have gm motor use the fel-pro #35562T,you don't need sealer with this gasket.

sqzbox 07-24-2010 10:58 PM

If you use the fel-pro gasket and no sealer and it still leaks, you got a bad thermostat housing. :(

Torque454 07-25-2010 12:03 AM

I use black RTV sealer from permatex. Seems to work better than the red or the blue that I used in the past. Although I took apart an engine that had been put together with brush on copper sealer.. that stuff was REALLY sealed up good. Better than any silicon stuff ive ever used.

sqzbox 07-25-2010 05:36 AM

It only takes one gorilla with a 1/2 ratchet one time to warp a thermostat housing. Another way to destroy one is cut the ridge on the flange with a sharp gasket removing tool or a putty knife. It's only aluminum. Torque to specs and no farther. On used housings, I check it with a straight edge and inspect the ridge. If either check fails, I toss them. Why? because I know I'm setting myself up for failure. RTV is just a band aid for a boo boo. It will work in some cases, but why not do it right the first time. :thumbup:

68NovaSS 07-25-2010 06:31 AM

It it's not an "O" ringed housing it's easy to flat sand and make it useable.

sqzbox 07-25-2010 09:26 AM

Flat sand and loose the ridge that seals the gasket. RTV will seal it, but who want's RTV goo sticking out between the housing and the intake. I guess if it doesn't bother you go ahead and use it. :thumbup:

stoney 81ta 07-25-2010 06:56 PM

Thanks for all your input,i ended up using the permatex copper with a stock paper gasket looks good so far.

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