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#1
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Thermostat Housing Gasket - Which Sealer?
Do you all like using Permatex Ultra Blue, Black, Red or some other type sealant?
Have to buy some and was curious as to what you think is best. |
#2
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I use Hylomar on the intake side.Tom
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#3
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Permatex form a gasket.
__________________
Jim Moshier 1971 Grand Prix 462ci SD Performance 6x heads 1962 Catalina 389 1968 Firebird 400-455 I haven't decided "If we ever forget that we're one nation under GOD, then we will be a nation gone under." - Ronald Reagan |
#4
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Quote:
RTV Silicone is for REPLACING a gasket, (used instead of a gasket) not for application onto a gasket. There's a dozen perfectly-good gasket sealers, including but not limited to Gasgacinch, High Tack, Copper Coat, Indian Head, Permatex #1, #2, and #3. Hylomar is top-shelf, but very expensive. "Best"? I don't know. I don't really care. Any of the ones I've listed--and others as well--are entirely adequate. When it's my money, I lean toward Gasgacinch. In the applications that I've actually used 'em on, Gasgacinch does everything Hylomar does, at 1/10 the price. There may be other applications where Hylomar is required--aerospace, for example. |
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#5
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I changed to Hylomar because of the clean up.I found it to be non hardening and WAY more EZ to clean than any other I have used.FWIW,Tom
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#6
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For ruff surfaces Permatex #3 Aviation works fine.
If the housing is bent you may need a new housing or make it flat. |
The Following User Says Thank You to Kenth For This Useful Post: | ||
#7
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Funny story: I was 16, and did some sort of cooling system repair that weekend. 1982 Monday winter morning; driving my 1968 LeMans to High school, and boom antifreeze steam erupts while 1/2 mile from the school.
Rather exciting for me to see the steam cloud. Upper hose blew off the Radiator inlet. Well lesson here: never apply RTV to radiator hose joints. |
The Following User Says Thank You to Half-Inch Stud For This Useful Post: | ||
#8
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#9
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Never had a problem using permatex ultra black as a gasket dressing....and mostly what I have handy
https://cdn3.evostore.io/documents/f...82180_spec.pdf
__________________
71 GTO, 463, KRE 295 cfm heads ported by SD Performance, RPM intake, Qjet, Dougs Headers, Comp cams HR 246/252 ...11 to 1 , 3.55 cogs, 3985lbs.....day three- 11.04 at 120mph ....1.53 60', 6.98 1/8 mile |
The Following 2 Users Say Thank You to mchell For This Useful Post: | ||
#10
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Before you do anything .... lap the bottom of the housing on something very flat. Same with the intake side if you have a block of metal or something to use.
Most used housings have a bend at the bolt hole ears from years of over tightening. Some new ones have less than perfect machining. And I've seen some OEM intakes with pretty rough machining on the gasket surface. |
The Following 2 Users Say Thank You to dataway For This Useful Post: | ||
#11
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I just replaced the thermostat gasket with Permatex Water Pump & Thermostat RTV Silicone Gasket Maker. The surfaces are a little rough, and the regular gasket was leaking into the bolt holes. Seems to have done the trick.
https://www.permatex.com/products/ga.../?locale=en_us |
#12
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Ah! The old leakin at the bolt hole trick. m
sounds like the Housing has a hairline fracture at the Bolt tab. I had 1 leak through the fracture. |
#13
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Give Gasgacinch a try. I bet you'll like it. And, as I said--very inexpensive compared to Hylomar.
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#14
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My 78 came from the factory no gasket silicone sealer.
__________________
Skip Fix 1978 Trans Am original owner 10.99 @ 124 pump gas 455 E heads, NO Bird ever! 1981 Black SE Trans Am stockish 6X 400ci, turbo 301 on a stand 1965 GTO 4 barrel 3 speed project 2004 GTO Pulse Red stock motor computer tune 13.43@103.4 1964 Impala SS 409/470ci 600 HP stroker project 1979 Camaro IAII Edelbrock head 500" 695 HP 10.33@132 3595lbs |
#15
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Quote:
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Greg Reid Palmetto, Georgia |
The Following 2 Users Say Thank You to Greg Reid For This Useful Post: | ||
#16
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Quote:
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#17
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Quote:
all the other products mentioned will work too but to claim (modern) RTV shouldnt be used on gaskets is not correct... as posted above, permatex says ultra black/grey can be used as a gasket dresser, meaning a light thin coat on both sides, especially for pitted surfaces. |
#18
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Permatex Water Pump & Thermostat RTV Silicone Gasket Maker - works well
https://www.permatex.com/products/ga.../?locale=en_us
__________________
Will Rivera '69 Firebird 400/461, 290+ E D-Ports, HR 230/236, 4l80E, 8.5 Rear, 3.55 gears '64 LeMans 400/461, #16 Heads, HR 230/236, TKO600, 9inch Rear, 3.89 gears '69 LeMans Vert, 350, #47 heads: Non-running project |
#19
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I drew the same conclusion on my own. Had those junk rubber rear pan seals split and leak. Use cork seal and Ultra Black and it will never leak a drop.
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#20
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LOL, I don't remember how my 77 came, from factory....maybe the non Eagle cars got no thermostat gaskets...
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1977 Black Trans Am 180 HP Auto, essentially base model T/A. I'm the original owner, purchased May 7, 1977. Shut it off Shut it off Buddy, I just shut your Prius down... |
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