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Thread: Head gasket question

  1. #1
    Join Date
    Aug 2017
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    33

    Head gasket question

    So I've heard that using 1998+ head gaskets on an SC will resolve the hg issue. Is this true? I didn't think it would work because the heads are different

  2. #2
    Join Date
    Jul 2005
    Posts
    425
    Good morning

    Are you addressing MLS gaskets? If so cylinder and block preparation surface (RA quality) must be done prior to installation. Even this is not a guarantee. Use search function for more information this subject. In the meantime here is an excellent head gasket information post in the FAQ section of the forum to get you started.


    http://www.sccoa.com/forums/showthre...about-this-car

  3. #3
    Join Date
    Apr 2002
    Location
    St. Charles, MO
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    20,990
    Quote Originally Posted by Legion View Post
    So I've heard that using 1998+ head gaskets on an SC will resolve the hg issue. Is this true? I didn't think it would work because the heads are different
    This thread has all the info you will need for the MLS gaskets. I know of several people that have used these MLS gaskets successfully without remachining the block surface (my self included). That said if rebuilding motor you definitely want the block surface as smooth as possible. In either case the heads must be resurfaced to be as smooth as possible and head studs are also needed. See the attached thread for surface RA, recommended sealer and torque specs.

    http://www.sccoa.com/forums/showthre...perma%20torque

    David
    1991 SC AOD 4.2..2.3 Whipple..........10.910 @ 125.61
    2016 SRT Challenger Hellcat.............750 rwhp 720 rwtq

    My Garage

  4. #4
    Join Date
    Aug 2017
    Posts
    33

    Head gaskets

    Thanks for replying but it seems more vague on the answer to my question will this stop the HG issue .yes my block surface is perfect and my heads have been resurfaced. I have not put them on yet as I am trying to figure this out on the 98+ mls gaskets

  5. #5
    Join Date
    Jan 2010
    Location
    Bossier City, LA
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    2,237
    Quote Originally Posted by Legion View Post
    Thanks for replying but it seems more vague on the answer to my question will this stop the HG issue .yes my block surface is perfect and my heads have been resurfaced. I have not put them on yet as I am trying to figure this out on the 98+ mls gaskets
    Stop it? No.

    Help ameliorate it? Yes.

    But too much pressure combined with driving like a fool will still manage to blow them. These just help raise the "Cut'er off, Henry, she's a'pumpin' mud!" point.

    RwP

  6. #6
    Join Date
    Apr 2002
    Location
    Madison, Ohio
    Posts
    17,589
    In order for a better gasket to "fix" the problem, it would have to be the gasket's fault in the first place.

    An MLS gasket will end the problem of dissimilar metal expansion rate with respect to the iron block/aluminum head situation. MLS gaskets are also nearly immune from electrolysis so that problem is essentially eliminated as well.

    The fact that all modern engines use MLS headgaskets, and a large percentage of them are turbocharged or supercharged lends credence to the above statements.

    But increased boost, lousy fuel, clogged cats, ageing cooling systems, low coolant level in general, ageing/failing fuel pumps, partially clogged injectors, or any other number of supporting system failures common in these cars will blow even the best headgaskets. It doesn't help that Ford saw fit to set these cars up with an excessively aggressive tune that relies very heavily on a marginally functional knock sensor.

    But having said all that, properly installed 98+ MLS headgaskets can be considered a permanent solution. Yes.
    Quote Originally Posted by Miller View Post
    Ya thats why i tape mine down. People think its bc i dont have a moonroof seal (which is true) but its really to keep my roof from ripping off .
    Email me here.

  7. #7
    Join Date
    Dec 2002
    Location
    Wintersville, OH
    Posts
    4,091
    Quote Originally Posted by xr7 dave View Post
    in order for a better gasket to "fix" the problem, it would have to be the gasket's fault in the first place.
    tell em!!!!!!!!!!!
    Making woosh sounds since 2010!

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