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Make Exhaust Gaskets?

Discussion in 'Early CJ5 and CJ6 Tech' started by Jonbbrew, Feb 23, 2021.

  1. Feb 23, 2021
    Jonbbrew

    Jonbbrew Member

    Paso Robles, CA
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    Mar 14, 2015
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    694
    Hello,

    mixed info but I’m hearing that there was not an exhaust manifold gasket for the 198’s. Also knowing parts are hard to find but haven’t located one either. Seen a few videos of making a gasket with copper sheeting.

    anyone know about this?
     
  2. Feb 23, 2021
    Oldpappy

    Oldpappy Member 2021 Sponsor

    East Tennessee
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    Feb 8, 2021
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    56
    I have only recently started working with the Buick V6 engines, but when I was in my teens and early twenties I owned an old Buick, and I remember something from the shop manual I had.

    On the old engines they didn't even use gaskets for the exhaust manifolds installed at the factory. They used a "Special Compound" on the joints. As strange as it sounds the manual said that when installing a new manifold to coat the mating surface with a mixture of oil and graphite. I did that on a 56 Century using 90wt gear oil with powdered graphite mixed in to a consistency of a rather fluid paste. Applied the stuff to the mating surfaces with a small paint brush and it worked fine. I drove that car for a few years and it never leaked. The 198 Fireball V6 is a direct descendant of that old "Nailhead", so you could try that.
     
  3. Feb 23, 2021
    PeteL

    PeteL Member 2021 Sponsor 2020 Sponsor

    Hills of NH
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  4. Feb 23, 2021
    CJ Joe

    CJ Joe Truckhaven Tough!

    Pinon Hills, CA
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    Nov 9, 2002
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    When I replaced my headers I used hi-temp silicone, no gasket. 8 years now and still perfect. Previously was the usual header/gasket maintenance headache.
     

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  5. Feb 23, 2021
    timgr

    timgr Eppur si muove. 2021 Sponsor 2020 Sponsor

    Medford Mass USA
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    I think the "iron on iron" exhaust manifold sealing has been going on a long time. The 198 is a comparatively modern design, and it would not surprise me if these engines came from the factory with no gasket. This works better than a flat composition gasket, which will blow out eventually. In the mid-70s, the mfrs also did away with the composition gasket sealing the pipe to the manifold, at first substituting an iron ring, and later casting the sealing surface into the manifold. Again, steel pipe bolts direct to the iron manifold.
     
  6. Feb 23, 2021
    Duff

    Duff New Member

    Missouri
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    Jan 23, 2021
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    I worked on a 1 owner, never apart, 1971 Buick GS, it had no exhaust gaskets and no leaks. If the mating surfaces are true, I'd try some high temp sealer with no gasket.
     
  7. Feb 23, 2021
    CHUGALUG

    CHUGALUG Member

    Silverton, OR
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    May 11, 2019
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    I made gaskets for my Tri Y header using Mr Gasket header gasket material. I also made Carb gaskets for my Weber and one off Cast aluminum intake manifold.Sourced from Summit Racing.

    [​IMG]

    I made four sets at one time as I was all set up for it so why not

    [​IMG]

    And the Carb gaskets these were made from some .060" rubberized stuff NAPA sells.

    [​IMG]

    Combination of cutting out holes with the material sandwiched between two pieces of plywood using a Forseter bit and hammer tapping and X acto knife and even small leather punches.
     
  8. Feb 23, 2021
    SFaulken

    SFaulken Member 2021 Sponsor 2020 Sponsor

    Marysville, WA
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    Most modern engines don't use gaskets, they just use Hi-Temp RTV, hell, half the Headers you order anymore come with a tube of it, and they tell you not to use gaskets.

    That being said, I won't use graphite composition style exhaust gaskets anymore. Not worth the trouble, because they're always guaranteed to blow out. I use a Soft Copper, or MLS style gasket, if I think I need one.
     
  9. Feb 23, 2021
    jeep2003

    jeep2003 Well-Known Member

    Vestal NY
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    Iv purchased uncut exhaust gasket material on ebay it comes in handy quite often
     
    Jonbbrew likes this.
  10. Feb 23, 2021
    mike starck

    mike starck Member

    salem,oregon
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    Recently made exhaust header gaskets for my 225 with hedman headers. I used .041"annealed copper from McMaster-Carr that worked great and was easy to work with.No leaks and the flange and head surface are sealed.Worth the trouble for me.
     
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  11. Feb 23, 2021
    PeteL

    PeteL Member 2021 Sponsor 2020 Sponsor

    Hills of NH
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    I imagine since they took the asbestos out.
     
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  12. Feb 23, 2021
    Keys5a

    Keys5a Sponsor

    Florida Keys
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    Its been a long time, but I believe the 198 and 225 are the same pattern. You should be able to use the 225 composition/metal gasket on your 198. Its unlikely the surfaces of the head and exhaust manifold are true enough to get away with no gasket, unless you have a machine shop skim them.
    Soft copper sheet also makes a durable gasket for exhaust manifolds.
    -Donny
     
  13. Feb 23, 2021
    truckee4x4

    truckee4x4 Grant Kaye 2021 Sponsor 2020 Sponsor

    Truckee CA
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    I’ve got access to a laser cutter that I’ve used to cut gasket paper before, let me know if I can help.
     
  14. Feb 24, 2021
    CHUGALUG

    CHUGALUG Member

    Silverton, OR
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    I have made header gaskets from scratch for SBC and FE Block Fords from this Mr Gasket material and always thought them to be superior in sealing and life span. I've never seen a copper header gasket but then I only been playing with cars for 45 years. So anything is possible.
     
  15. Feb 24, 2021
    SFaulken

    SFaulken Member 2021 Sponsor 2020 Sponsor

    Marysville, WA
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    Free Shipping on Orders Over $99 at Summit Racing
     
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  16. Feb 25, 2021
    CHUGALUG

    CHUGALUG Member

    Silverton, OR
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    OK now I have seen them
     
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  17. Feb 25, 2021
    SFaulken

    SFaulken Member 2021 Sponsor 2020 Sponsor

    Marysville, WA
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    They're not something you really find at most FLAPS, just speed/race shops in my experience. A little pricey, but if you've got headers especially ones that consistently leak, they work great.
     

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