Heat crossover ????

Mopar Racers Forum

  1. yellow rose

    yellow rose Master Of Insanity

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    Sunday I need to block the heat crossover in an intake manifold. I can’t do it with a gasket (I could do it with a gasket, but I’d have to machine the intake to fit with thicker gaskets and I don’t want to do that) so I’ve read (IIRC) that some have stuffed the crossover with aluminum foil as tight as you can and it worked.

    Any one done it and had it work? I’m also going to test a CoolCarb spacer and that’s why I need to block it off.

    TIA
    YR
     
  2. 1969383S

    1969383S FABO Gold Member FABO Gold Member

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    What?
     
  3. Professor Fate

    Professor Fate Push the button, Max...

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    Any reason you can't use block filler?
     
  4. TT5.9mag

    TT5.9mag Two atmospheres are better than one

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    Never heard of aluminum foil but I just blocked one off with thin stainless shim stock under the gaskets.
     
  5. Rmoore

    Rmoore Well-Known Member

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    I just bought the Mopar performance intake pan gasket!! It just doesn’t have the hole for the crossover !! But the gasket was the same thickness as the one with the hole! So I’m not sure I understand about a thick gasket and having to machine the intake ???? And yes before I bought the gasket I used the foil ! Seem to work fine !! Now mind you this 20 years ago when I did all of this !!
     
  6. RustyRatRod

    RustyRatRod Bla de blizhibliz de blatde blizi bla bla FABO Gold Member

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    That's the one I got. Intake valley pan with the holes blocked off. Problem solved.
     
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    • j par

      j par Well-hung Member

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      How far the mighty have fallen! LOL at the beginning of the year your building an R-block, today stuffing an intake manifold with tinfoil... Bahahaha...
       
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      • RustyRatRod

        RustyRatRod Bla de blizhibliz de blatde blizi bla bla FABO Gold Member

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        Sorry even I gotta admit that was funny. ......and yet here I am whoopin up a big block to go in a 64. Who'da thunk it?
         
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        • Cudafever

          Cudafever Well-Known Member

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          I don't think YR is talking big block and metal valley pan gaskets.

          Last i hered it was a R Block(Race small block.)

          I think the key with alu foil is getting it tight enough that no air can escape thru it.

          with open headers i don't see it pushing thru.......with an exhaust system...maybe
           
        • yellow rose

          yellow rose Master Of Insanity

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          Not mine. I work on lots of stuff.
           
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          • j par

            j par Well-hung Member

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            Me too..
             
          • yellow rose

            yellow rose Master Of Insanity

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            I should have mentioned it’s a small block. I wish the owner would have used paper gaskets but he didn’t. So I’m kinda married to the steel shim gaskets. Otherwise I have to mill the intake to fit and I don’t want to reinvent the wheel to put on a heat shield.
             
          • Dana67Dart

            Dana67Dart Like a fine wine, only getting better with age! FABO Gold Member

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            how about this, cut the opening for the crossover a little bigger on the gasket and then cut a matching steel piece to fit / heck the crossover hole is probably oversized to start with
             
          • '63GT

            '63GT Well-Known Member

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            I have on BB and SB. But it takes a lot of foil and you have to drive it in with a punch, or will erode away.
            Finally, I did something more permanent.
            I lined the port with foil and poured a melted piston in the crossover hole. Plucked out the foil and blended it into the bowl. Flowed better too ;)
            Nobody laughed at me after that..
             
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            • brian6pac

              brian6pac Well-Known Member

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              You know you can't use a steel shim gasket with aluminum intake, It will always leak.
              At some point sooner than later you will have a major mess on your hands.

              I knew I had a copy somewhere of the 6 pack intake gasket bulletin.

              70-9-12.jpg
               
              Last edited: Jul 25, 2020
            • dano

              dano Evil Handy Man

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              I have heard but never tried it, pot (i.e. fill) the crossover with 100% Silicone. Again, not sure of the results.

              Could get them TIG'd closed?
               
            • brian6pac

              brian6pac Well-Known Member

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              I would use a shim of stainless. It has always worked for me and never fails.
               
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              • Rmoore

                Rmoore Well-Known Member

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                I’ve never used anything but the steel shim intake gasket on my B/RB motors !! All my buddies motors I built for them never used anything but steel shim intake gasket ! Not one leak in 30 years ! Not one. ! All of them have aftermarket aluminum intakes on them to this day !! No leaks as of yet !!
                 
              • JBurch

                JBurch Well-Known Member

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                What he said; just cut a square and cover the hole......when I did mine, I cut up an old coffee can

                I can't help myself.......a man of your intellect couldn't problem solve this..........yikes!!!!!!!!!!
                 
              • Daves69

                Daves69 Well-Known Member

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                I just blocked off an old cracked (on both sides) CH4B with shims cut from a stainless outlet cover. A little too thick for the steel shim VP gasket so I recessed them into the intake.
                 
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                • yellow rose

                  yellow rose Master Of Insanity

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                  LOL...you’re kidding me right? I haven’t seen a metal coffee can in 30 years or something!!! I don’t have one to cut up!

                  Good idea though.
                   
                • yellow rose

                  yellow rose Master Of Insanity

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                  Yeah, the guy who owns it bought the shim gaskets and put them on. Like I said, I’d have to cut the intake if I switch to paper gaskets, and I don’t want to do that.

                  And, it’s been working since 2015. And now that I typed that it will screw me hard!.
                   
                • yellow rose

                  yellow rose Master Of Insanity

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                  LOL...forgot to mention I usually REMOVE intake manifolds with heat crossovers in them, and if I, stuck with it, I use a paper gasket with the steel shim to block it off.

                  Trying to get this done without machine work if at all possible.

                  May have to start looking for a coffee can.
                   
                • yellow rose

                  yellow rose Master Of Insanity

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                  I like that idea too.

                  Thanks.
                   
                • Daves69

                  Daves69 Well-Known Member

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                  The cover was .032" thick BTW.
                   
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