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  1. #1
    I was like blam! thehookerman's Avatar
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    what kinda sealer do guys use to seal up log style headers.thanks hooker
    im into spanish cheese

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    E-7 Sheepdog (ret) SmokinLowriderSS's Avatar
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    Back when mine weren't warped, I used standard metal/composition gaskets.

    After they warped from age, I had to go to DOUBLED header gaskets.

    My Lightning headers have such big tubes, header gaskets don't fit right and leak, so I use Hi-Temp Red RTV.

    I'd just use a bead of Hi-Temp RTV and let set-up a day or even 2 if you're not in a hurry, then bolt them up.
    "As democracy is perfected, the office of president represents, more and more closely, the inner soul of the people. On some great and glorious day the plain folks of the land will reach their heart's desire at last and the White House will be adorned by a downright moron."
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  4. #3
    I was like blam! thehookerman's Avatar
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    shit i was hoping you guys would say the black rtv stuff will work owell ill just have to unbolt and redo .thanks alot just wanted to be surtain.
    im into spanish cheese

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    E-7 Sheepdog (ret) SmokinLowriderSS's Avatar
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    I've been told there is a hi-temp black, just never used it myself (can't claim to have seen it, but haven't looked either).

    As long as irt is a hi-temp stuff they rate for exhaust manifolds, leave it, if not, yea, it'll be nasty shortly.
    "As democracy is perfected, the office of president represents, more and more closely, the inner soul of the people. On some great and glorious day the plain folks of the land will reach their heart's desire at last and the White House will be adorned by a downright moron."
    H.L. Mencken

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    I was like blam! thehookerman's Avatar
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    it was the high temp stuff so I should probably be good but I didnt let it set up like you stated any probs?
    im into spanish cheese

  8. #6
    E-7 Sheepdog (ret) SmokinLowriderSS's Avatar
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    Quote Originally Posted by thehookerman View Post
    it was the high temp stuff so I should probably be good but I didnt let it set up like you stated any probs?
    Just more mess when you want to remove them.

    They are now quite effectively "glued on".
    Letting it cure up first leaves a "parting surface" for future disassy.
    "As democracy is perfected, the office of president represents, more and more closely, the inner soul of the people. On some great and glorious day the plain folks of the land will reach their heart's desire at last and the White House will be adorned by a downright moron."
    H.L. Mencken

    OBAMA: Some people deserve this.
    The rest of us are being dragged along kicking and screaming.

  9. #7
    Senior Member CK7684's Avatar
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    Mine have black RTV with no issues...cleanup hasnt been too bad with a sharp razor blade...

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    Flowtech Exhaust Real-Seal aluminum multi-layer gaskets, completely reuseable, never burn out, can be port matched, www.flowtechheaders.com , a division of Holley Performance, tech line (270) 781-9741

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    CarbGuy RumRunner's Avatar
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    Usually just use a good High Temp RTV.

  13. #11
    steelcomp was here
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    I was told there's no such thing as "hi temp" RTV....
    RTV silicone is RTV silicone, and it's all the same, just more marketing hype...
    If God is your co-pilot, change seats!
    Acts 2:38, the perfect answer to the perfect question.

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    Senior Member earlbrown's Avatar
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    Quote Originally Posted by steelcomp View Post
    I was told there's no such thing as "hi temp" RTV....
    RTV silicone is RTV silicone, and it's all the same, just more marketing hype...

    Don't forget colored dye too!

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    The blue smells and feels different than the black or copper...

    Maybe i'll try and set some on fire and see

  16. #14
    cfm
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    It would be suprising to me if silicone is just silicone. Possible ? Yes...I guess since I'm no chemist. I would need to hear factual chemical info to show that they are all the same, otherwise I don't think I'll believe it.

    However, using different type silicone's in high heat situations (exhaust) has shown to me, anyway, that the Ultra Black to work where others have failed.

    One case in point: We have sealing problems in our (industry wide - not just one person's private sled) snowmobile (2 stroke) exhaust joints for some reason (ton of heat and ton of vibration probably) and ultra black makes that much of a difference vs others.

    Because of this,and ahem, in some high rpm/load/mph trucks towing loaded trailers for up to 16-18hrs in a day experiencing exhaust and exhaust gasket issues, I use ultra black in most everything that calls for silicone....just because. You ever heard the phrase "Once you go black, you never go back ?" LOL.

    Quote Originally Posted by SmokinLowriderSS View Post
    I'd just use a bead of Hi-Temp RTV and let set-up a day or even 2 if you're not in a hurry, then bolt them up.
    Good point here. Many people just slather some one and torque the item down right after. Squeezes most of the silicone out of the joint.

    What I do (others do different techniques that works fine too I'm sure) with most items that need RTV is to put on RTV like you would, let set up just enough to hold gasket, and then install part to about 1/4 of it's torque and proper sequence. Let the RTV cure, then go back and tighten to proper full torque.

    I believe it is better to 'squeeze' cured silicone than it is to fully squeeze still liquid silicone and then have it cure.

    Maybe I'm just fuped up here. LOL.
    Last edited by cfm; 01-13-2009 at 06:31 PM.

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