Thread Sealant For Header Bolts On A Stock 440 Motor ?

[RPMagoo]

Had to pull the headers to replace the power steering box, on My 62 Dart, with a 440 motor. -- What is the best, (assume Hi Temp), thread sealant to put on the bolts ? -- I see that Permatex, high temp, sealant is good to 400 degrees -- Is this good enough ?

 

[Bird 426]

Do the exhaust bolts go into the water jackets on a 440? If not, don't use anything. If they do, I use this on the end studs in my SB.

 

[snakeoil24]

Indian head by permatex

 

[T2R9]

Always used Permatex #2 in water jackets. Never a problem.

 

[max426]

I use this, never any issues.
Jim

 

[ckessel]

End holes on the head go into the water jacket. If you can, put studs there with sealant on the threads. The rest of the holes are blind.

 

[RemCharger]

End holes on the head go into the water jacket. If you can, put studs there with sealant on the threads. The rest of the holes are blind.

On a stock head they're all water

 

[padam]

Orange permatex

 

[ckessel]

Was thinking small block. Thank you for the correction.

 

[khryslerkid]

Don't use silicone! Silicone is for rain gutters.

Non hardening #2 Permatex is great.

Just started using this with good luck...

 

[RPMagoo]

Do the exhaust bolts go into the water jackets on a 440? If not, don't use anything. If they do, I use this on the end studs in my SB.

View attachment 1843600

Yes they do -- Thanks.

 

[WileE]

Why fuss ? Use studs. Eliminates the problem. Except on some header configurations, studs are not possible on one or two holes. Then use a sealer on the bolt.

 

[Geoff 2]

Use the sealant in post #2 or similar. NOT silicon.

 

[moparedtn]

Don't use silicone! Silicone is for rain gutters.

Non hardening #2 Permatex is great.
View attachment 1843847

Just started using this with good luck...
View attachment 1843848

Yep. As an old fire sprinkler guy, I always had a small jug of this stuff laying around - we old school fitters put threaded
pipe/fittings together with "tape and dope" - and honestly I usually just used the teflon tape on sprinkler pipe, so I wound
up with full containers of this stuff laying around.
I use it on header bolts, always have. Works fine, nary a leak.

Oh, about just using tape on sprinkler pipe:
I got away with just taping pipe joints for decades because I'm fussy with thread depths on fabbed pipe...

 

[dvw]

Been building engines, transmissions, and axles for 45 years. Threaded connections get white Teflon sealer. It's cheap, it works. In fact the large tube I have is at least 15 years old. I know some will not believe and scoff. It will seal brake lines as well. Never assemble stainless brake lines without it. Keeps oil from wicking up intake bolts also.
Doug