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To Goop or Not to Goop?

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  • To Goop or Not to Goop?

    When replacing the water-neck gasket(s) who goops with RTV Silicone or other sealer? Who does not goop and why?

    I know with small-block Chev and Pontiac water-necks you goop then up good. Especially those crappy chrome ones that never seal until you lightly sandblast the chrome off of the mating surfaces. Good trick for any water-neck that is not warped but still leaks the etching from the sandblasting creates tooth for the sealant and gasket.

  • #2
    What I do is to insure that the mating surface is perfectly (?) even by sanding thermostat housing with 600 grit sandpaper on a piece of glass. Then I use an aviation grade sealant made by Form-a-Gasket. Seems to work for me.


    • #3
      Permatex Aviation Form-a-Gasket Sealant Liquid #80019. LIGHT skim between head and gasket and between gasket and heater valve.
      The more I know about Minis, the more I know I don't know about Minis.


      • #4
        I sand surface flat as well. But use a THIN smeer of NAPA Ultra black RTV. We use the same sealer on all the show/race cars at work as well.
        "remember, in this country, they drive on the wrong side of the road"
        ‘64 Austin Countryman-???
        '60's Austin mini truck - the chicken truck
        '60 Morris Van - Marvan
        '55 Chevy wagon- the heavy Chevy


        • #5
          Do just as Jerry mentions. That sequence has worked well for me in the past as well. The cleaner and flatter the pieces, the better your resulting seal.