Intake design for stock appearing class and needed a winter project

Mopar Racers Forum

  1. furrystump

    furrystump Well-Known Member

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    Thank you!
     
  2. Scampin

    Scampin Well-Known Member

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    Cheatin sob. Would be interested in seeing it hooked to a head on a flowbench to get an idea of flow and mixture problems before you bolt it to the bullet.
     
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    • furrystump

      furrystump Well-Known Member

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      Going to run a/f meter on both sides and check the plugs a bunch.
       
    • furrystump

      furrystump Well-Known Member

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      I have a spare ported head but no valves or flow bench.
       
    • pishta

      pishta I know I'm right....

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      How stock is a W2 head? I was
      almost stock on the 360 lil red express truck. How about a stock 68 273/4 intake? Massage the ports to make the same 340 size by adding material to the bottom... cut the bottom out and lower it,, sinking the floor? Looks like you could manage that with a big band saw and some creative metalwork. There was an AMC racer that put 2 heads together top and bottom to raise the port height. How he did it, not sure but it would have probably been an angle cut to keep the chamber intact, just cutting the corner off and putting a taller corner on...lots of work for sure. Check out David Vizard's book on carburation. He got a GM spread bore intake to perform as well as "any aftermarket intake" just by shaping and honing the inside transitions.
       
    • furrystump

      furrystump Well-Known Member

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      W2’s have relocated ports. Also you can’t run a stock intake casting. X head is it for small block mopar. Getting the casting back after the sealing surface was inset today. Still have two more intake runners to make.
       
    • PRH

      PRH Well-Known Member

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      That.... and they’re not legal for FAST or Super Car.
       
    • furrystump

      furrystump Well-Known Member

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      One runner,

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      • furrystump

        furrystump Well-Known Member

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        Need to port match it. Clean up inside the runner a bit.
         
      • 408 swinger

        408 swinger FABO Gold Member FABO Gold Member

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        Looking forward to results!
         
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        • PRH

          PRH Well-Known Member

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          Same here!!:thumbsup:
           
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          • 1Badcolt

            1Badcolt Well-Known Member

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            Cool seeing oem parts modified !
             
          • 318willrun

            318willrun Utube channel 318willrun

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            Just found this thread. What a neat project. Subscribed
             
          • Scampin

            Scampin Well-Known Member

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            Just curious is the plenum lower than the runners? Wondering if you are going to run into fuel puddling issues.
             
          • furrystump

            furrystump Well-Known Member

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            It is not lower, but close. I plan on roughing up the floor pretty good to give it some edges to atomize off. The one I’m running now, the upper plenum floor is 1 1/2” maybe from the carb base. Really just hammering the a/f charge into it. With this at least there is 6+ inches from carb base to plenum floor. Also I can bull nose the transition a bunch as it makes the turn laterally.
             
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            • furrystump

              furrystump Well-Known Member

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              Well all four runners are done. Need to roughen up the inside with a burr and weld the ends on. Ugly on the outside just like me! ! Working within the area I have has made the runners nowhere near ideal, but we’ll see what happens. Still have to fill in the original upper runners and bolt/epoxy the the two together.

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              • Scampin

                Scampin Well-Known Member

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                That looks like a hell of a project. What does the inside of the cut up manifold look like with the new plenum not installed? Just curious on what you were working with space wise.
                 
              • furrystump

                furrystump Well-Known Member

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                This is what remains of the original intake.

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                • furrystump

                  furrystump Well-Known Member

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                  Because of the large valleys that inner manifold bolts are in I can’t turn the runners towards the center like a tradition single plane.

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                  • pishta

                    pishta I know I'm right....

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                    That's awesome Bro, a little epoxy and a lot of smoothing and paint will make it stock appearing! Reminds me of early Nascar when they could slide the restrictor plate out of the Hemi's intakes like a piece of toast out of a toaster. Smokey wasn't the only "cheater"!
                     
                  • GTX JOHN

                    GTX JOHN Well-Known Member

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                    WE run Stock Eliminator Mopars.

                    There are several builders that can get you over .2+ with a professionally
                    modified and acid ported manifold AND they have to appear stock when inspected
                    off the car by tech. I have tried them back to back.
                    I know it is not the same but our stockers have to have stock lift and stock cc heads
                    but we do have Slicks and headers with stock shipping wt. = 10.5 @124 so it is apples
                    to oranges comparison

                    To do the manifolds is time consuming and they charge about 500 to 750 - You will pick up a amazing amt. The manifolds are really hurting what the heads can flow.

                    Goggle John Irving Drag Racer to see our 340 cars
                     
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                    • furrystump

                      furrystump Well-Known Member

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                      The exhausts are opened a bit and I remember a note worthy improvement from it. My next step for the exhaust manifolds might be ceramic coating inside and out to keep under hood temps down. I want to do some tests in regards to what the temp actually is under the hood during a run. A number of guys acid dip them.
                       
                    • furrystump

                      furrystump Well-Known Member

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                      Epoxy the exterior to seal any pin holes.

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                      • furrystump

                        furrystump Well-Known Member

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                        Filled in the original upper intake tract.

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                      • A56

                        A56 MoParAffliction FABO Gold Member

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                        Wonder what the weight of this will be compared to stock?
                         
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