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Old 04-02-2019, 11:50 AM   #1
19Fordy
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Default What is the best head bolt thread sealer ?

Years ago I used FEL PRO Gray Bolt Prep # GRA2. It was the best. Now it's no longer being made. Contacted Permatex and they recommended ULTRA GREY TORQUE GASKET MAKER # 82194.
https://www.autozone.com/sealants-gl...ker/306563_0_0

I am dubious.

What do you folks recommend for thread sealer flathead head bolts?

Thank you. JIM

Last edited by 19Fordy; 04-02-2019 at 12:17 PM.
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Old 04-02-2019, 04:01 PM   #2
RalphM
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Default Re: What is the best head bolt thread sealer ?

Aviation permatex
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Old 04-02-2019, 04:33 PM   #3
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Default Re: What is the best head bolt thread sealer ?

Quote:
Originally Posted by RalphM View Post
Aviation permatex
Ralph,

Agreed! That's the best!

See you in June....

Phil
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Old 04-02-2019, 05:23 PM   #4
flatjack9
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Default Re: What is the best head bolt thread sealer ?

A good grade of teflon pipe dope is what I have used for years.
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Old 04-02-2019, 07:02 PM   #5
Talkwrench
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Default Re: What is the best head bolt thread sealer ?

Brian put me on to Loctite 577. lookin' good so far..
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Old 04-02-2019, 07:26 PM   #6
KiWinUS
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Default Re: What is the best head bolt thread sealer ?

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3M 8001 weatherstrip cement
Used for many years on hundreds of engines where bolt/stud goes into water jacket from stock to full blown race engines. Never a leak! In the 80-90's it was the standard in NASCAR to use on valve cover gaskets so you would never have a leak.
Cheers
Tony
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Old 04-02-2019, 08:05 PM   #7
Dave Castle
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Default Re: What is the best head bolt thread sealer ?

Permatex high performance Thread Sealant # 56521.
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Old 04-03-2019, 12:11 AM   #8
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Default Re: What is the best head bolt thread sealer ?

Is some anti-seize out of question here for non race motors? Not a true sealer but makes the bolts come out and gumms up the water flow. I don't know though.
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Old 04-03-2019, 12:31 AM   #9
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Default Re: What is the best head bolt thread sealer ?

Jess you want sealing and threadlocking...with anti-seize the studs will come out any time you want to remove the head...
I use loctite pipethread sealer...has a fixed torque rate...meaning it holds the stud but not in an absolute irongrip if you want to remove it.
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Old 04-03-2019, 12:42 AM   #10
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Default Re: What is the best head bolt thread sealer ?

Hey Murre, thank you. I at least know, anti-seize changes torque values. Just curious, something like perm gen1# indianhead or anti-seize is bad. Just curious.

Last edited by Tinker; 04-03-2019 at 12:48 AM.
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Old 04-03-2019, 05:47 AM   #11
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Default Re: What is the best head bolt thread sealer ?

Permatex nr1 is hard setting so works great in that aplication.
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