Using cast iron exhaust manifold question

Mopar Exhaust Systems

  1. ssba

    ssba Well-Known Member

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    I am working on a car I have decided to use a pair of truck cast iron exhaust manifolds.
    Mostly because these happen to fit where every header I had laying around wouldn't.
    My question is pertaining to the spring controlled heat riser thats only on one of the manifolds. It does move free and doesn't have a loose pivot bore that I am worried about leaking . Should I cut it out or leave it alone.
    My guess is it is there to push heat up into the intake manifold.
    My intake has heat block off plates since it is the early 60s longram tubes.
    Will this weighted butterfly just make noise or is it benifical in some way I am not seeing? I'm thinking of cutting it out and installing pipe plugs in the pivot pin bores to seal it up.

    IMG_20170202_155824_829.jpg

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  2. moparmat2000

    moparmat2000 FABO Gold Member FABO Gold Member

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    Its sonOramic. Dude thats cool. Only seen a long horn crossram in books, and in an old johan 68 300 model i built.

    Its for a heat riser for preventing cold start idle issues, and carb icing in cold damp weather. If your sonOramic doesnt have heat risers which i can see they obviously dont, i guess you can cut it off, or why not wire it full open. You may eventually change to a different manifold later on for a different reason, then you will wish you had not cut it off.
     
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    • 383Scampman

      383Scampman Well-Known Member

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      Because your intake heat is blocked your heat valve in the manifold is useless . Option #1. braze the butterfly in the open position . #2. remove butterfly and plug holes where the shaft was . #3. do nothing and it may stick closed and/or it may rattle . I think all options are o.k.. Later, Tom
       
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      • ssba

        ssba Well-Known Member

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        Thanks guys, I think I'll cut it out and plug it so it
        won't leak or rattle down the road.
        New problem, In the top picture you can see the long nuts that hold
        these on. I am missing two if someone reading this has some spares.
         
      • sr71mopar

        sr71mopar P-18 4 door

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        Just went through myself. There are bushings in the manifold where the shaft goes through. If the bushing stays put, tap it 1/8" NPT. If the bushing comes out, you can drill it 7/16" and tap it 1/4" NPT.
         
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        • moparmat2000

          moparmat2000 FABO Gold Member FABO Gold Member

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          Btw is that a studebaker frame its in?
           
        • ssba

          ssba Well-Known Member

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          Put my Barracudas on hold again due to no parts money. This is a 56 DeSoto. Been collecting dust for a decade, trying to get a little further on it. Working on the exhaust today.

          2012-10-01_08-31-40_193-1 (1).jpg
           
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          • clifftt

            clifftt Well-Known Member

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            That is way cool!
             
          • ssba

            ssba Well-Known Member

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            Thanks, one of my never ending projects.
            Ten years or so ago I decided to put a 440 in it.
            Then a Dana, then a 4-speed. Time to make it driveable again.
             
          • AJ/FormS

            AJ/FormS 68 B'cuda fb, Form S clone ... 367/A833/3.55s

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            Oh man she's a beauty!
             
          • 71DodgeDemon340

            71DodgeDemon340 FABO Gold Member FABO Gold Member

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            I agree dont try to weld cast as its a tedious process. A lot easier to just cut it off, tap both sides and get some nice Allen head threaded plugs and seal the holes off, thats what i did
             
          • ssba

            ssba Well-Known Member

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            That's what I ended up doing. I used a couple lifter gally pipe plugs from the back of a big block. They were 3/8 npt.
            The cast iron was very easy to drill and tap.
             
          • 71DodgeDemon340

            71DodgeDemon340 FABO Gold Member FABO Gold Member

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            Plus it looks factory, im sure its possible to weld the cast but with all the pre heating procedures its a pain in the a55.

            If your looking for a recommendation on paint id recommend cast blast sold by eastwood
             
          • ssba

            ssba Well-Known Member

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            Yes going to paint them. Waiting for a dry day to sand blast them outside. I will probably paint the pipes and mufflers also. Cleaning up some old takeoff mufflers
            and fabricating some hangers now.

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