70 Dart S6 to 383BB conversion - Cast Iron Manifolds

Mopar Exhaust Systems

  1. rebuilder67

    rebuilder67 Well-Known Member

    Messages:
    59
    Likes Received:
    8
    Joined:
    Apr 2, 2011
    Location:
    Ebensburg, Pa.
    Local Time:
    10:20 AM
    Guys,

    My motor build will be mild. Purple cam, mild compression, roller rockers, tunnel ram with holley 400's. Headers that will fit are well over $1000+ additional parts. My engine builder says I can just use stock manifolds with no performance sacrifice. My issue is the manifold set I have I don't know what model car they came out of. My 383 is a date coded May 1970 but I think it may have come from a monoco or something larger than an a body. I'll post pics. The pass side turns straight down to the ground and I think that will work fine on that side. The driver side flares out 30 to 40 degrees maybe? Towards the drivers side frame. We all know with the z-bar linkage and the torsion bar the drivers side is challenging.

    Can anyone tell from the picks if these might work for me. I don't have the engine right now. It's with the builder. I'll have it back in the spring and I'm trying to stay ahead of slow downs/challenges. Appreciate anything you can offer other than $1000 to $1500 in headers. My budget is very low. Thanks, again!

    IMG_0094.JPG
     
  2. halfafish

    halfafish Damn those rabbits, and their holes! FABO Gold Member

    Messages:
    2,566
    Likes Received:
    2362
    Joined:
    Aug 14, 2016
    Location:
    SW Washington
    Local Time:
    7:20 AM
    What are the casting numbers on your manifolds?
     
    • Agree Agree x 1
    • rebuilder67

      rebuilder67 Well-Known Member

      Messages:
      59
      Likes Received:
      8
      Joined:
      Apr 2, 2011
      Location:
      Ebensburg, Pa.
      Local Time:
      10:20 AM
      I'll get them and post ASAP. Thanks halfafish.
       
    • rebuilder67

      rebuilder67 Well-Known Member

      Messages:
      59
      Likes Received:
      8
      Joined:
      Apr 2, 2011
      Location:
      Ebensburg, Pa.
      Local Time:
      10:20 AM
      From my pics the drivers side looks like 2951861-5. Pass side ends in ***9876.
       
    • MoparMike1974

      MoparMike1974 FABO Gold Member FABO Gold Member

      Messages:
      3,488
      Likes Received:
      2812
      Joined:
      Jun 16, 2017
      Location:
      Maryland
      Local Time:
      10:20 AM
      2951861 C body 383 / 400 / 440 70-73

      2899876 B&C body 400 / 440 1972

      ...from Galen's casting # book.
       
    • 4mulas

      4mulas Fixem'up

      Messages:
      523
      Likes Received:
      165
      Joined:
      Dec 23, 2006
      Location:
      North of great falls
      Local Time:
      7:20 AM
      I think you’ll have issues with the drivers side manifold and steering gear
       
    • ragtopfury

      ragtopfury Well-Known Member

      Messages:
      3,122
      Likes Received:
      2977
      Joined:
      Jul 14, 2011
      Location:
      Manchester, MD
      Local Time:
      10:20 AM
      I don't have the numbers, but I believe you'd be much better off with the factory hi-po manifolds from a 69/70 C body
       
    • rebuilder67

      rebuilder67 Well-Known Member

      Messages:
      59
      Likes Received:
      8
      Joined:
      Apr 2, 2011
      Location:
      Ebensburg, Pa.
      Local Time:
      10:20 AM
      Does anyone know the casting # for a stock drivers side manifold? Like what might have been on a 68' 383 Dart GTS? Not sure if 4 speed is different? Mines a 4 spd. Thanks Guys.
       
    • rebuilder67

      rebuilder67 Well-Known Member

      Messages:
      59
      Likes Received:
      8
      Joined:
      Apr 2, 2011
      Location:
      Ebensburg, Pa.
      Local Time:
      10:20 AM
      Would those work on the Dart? Thanks.
       
    • rebuilder67

      rebuilder67 Well-Known Member

      Messages:
      59
      Likes Received:
      8
      Joined:
      Apr 2, 2011
      Location:
      Ebensburg, Pa.
      Local Time:
      10:20 AM
      Yep. I think it's gonna be tight. Thanks 4mulas.
       
    • ragtopfury

      ragtopfury Well-Known Member

      Messages:
      3,122
      Likes Received:
      2977
      Joined:
      Jul 14, 2011
      Location:
      Manchester, MD
      Local Time:
      10:20 AM
      Yeah, but like said I don't have the casting number handy. I suppose either of us could Google it......lol
       
    • rebuilder67

      rebuilder67 Well-Known Member

      Messages:
      59
      Likes Received:
      8
      Joined:
      Apr 2, 2011
      Location:
      Ebensburg, Pa.
      Local Time:
      10:20 AM
      Good point... I'll start. Thx!
       
      • Like Like x 1
      • RAT ROD AL

        RAT ROD AL I know just enough to be dangerous FABO Gold Member

        Messages:
        5,849
        Likes Received:
        6926
        Joined:
        Jan 18, 2013
        Location:
        St. James City. FL.
        Local Time:
        10:20 AM
        I may have a pair of these. I'll take a look asap. If OP is interested
         
      • MoparMike1974

        MoparMike1974 FABO Gold Member FABO Gold Member

        Messages:
        3,488
        Likes Received:
        2812
        Joined:
        Jun 16, 2017
        Location:
        Maryland
        Local Time:
        10:20 AM
        Al, I think thats what he already has.
         
        • Agree Agree x 1
        • RAT ROD AL

          RAT ROD AL I know just enough to be dangerous FABO Gold Member

          Messages:
          5,849
          Likes Received:
          6926
          Joined:
          Jan 18, 2013
          Location:
          St. James City. FL.
          Local Time:
          10:20 AM
          How about this one for the left side?
          And I do have 2899879 for the right..
          20210124_221835.jpg 20210124_221848.jpg
           
        • 71GSSDemon

          71GSSDemon FABO Gold Member FABO Gold Member

          Messages:
          3,233
          Likes Received:
          4954
          Joined:
          Jul 27, 2018
          Location:
          Rosendale, WI
          Local Time:
          9:20 AM
          We used big block B body manifolds (way cheaper than big block A body manifolds) on Dad's 69 Barracuda. All we had to do was cut a couple inches off the bottom of the steering column outer housing where it comes through the firewall. Cut the tube and slide the end bushing/bearing up closer and reattach. This gave plenty of room for the Bbody manifolds with manual steering.
           
          • Like Like x 1
          • thesiren74

            thesiren74 Well-Known Member

            Messages:
            1,902
            Likes Received:
            1552
            Joined:
            Feb 23, 2014
            Location:
            kenosha,wi
            Local Time:
            9:20 AM
            Aren't big block a-body manifolds just as much as headers?
             
            • Agree Agree x 4
            • thesiren74

              thesiren74 Well-Known Member

              Messages:
              1,902
              Likes Received:
              1552
              Joined:
              Feb 23, 2014
              Location:
              kenosha,wi
              Local Time:
              9:20 AM
              Tunnel ram and purple shaft yeah i think headers would be a better choice.
               
              • Agree Agree x 1
              • Dartnut

                Dartnut Don't hate me because i'm beautiful

                Messages:
                11,771
                Likes Received:
                4836
                Joined:
                Apr 19, 2007
                Location:
                Southern Alberta
                Local Time:
                8:20 AM
                This is my opinion and my opinion only.
                If your engine builder says that using stock log cast iron manifolds isn't going to hurt performance on a tunnel rammed big block with a cam in an A-Body, it's time to find another engine builder.
                You will lose at least 50 or more horsepower alone using them with your set up.
                Now, if the engine was dead stock, the hit wouldn't be so bad.

                If I were you, I would look on BigBlockDart.com and do some reading, there is a lot of info on there about using stock manifolds versus headers (both cheap and expensive) and the fitment issues with all of them.

                My brother back in the early '80s bought a '71 Duster with a mild 440 in it that had the exact manifolds that you pictured on it.
                We swapped out them for some Hedman B-Body headers, and the difference was astonishing.
                Sure, they were a pain to install, but the difference was night and day.
                 
                • Like Like x 2
                • Agree Agree x 1
                • 66fs

                  66fs FABO Gold Member FABO Gold Member

                  Messages:
                  6,168
                  Likes Received:
                  2672
                  Joined:
                  Sep 9, 2009
                  Location:
                  Greenwood, South Carolina
                  Local Time:
                  10:20 AM
                  At least $1,000 for A body, big block manifolds.
                   
                  • Like Like x 1
                  • Agree Agree x 1
                  • thesiren74

                    thesiren74 Well-Known Member

                    Messages:
                    1,902
                    Likes Received:
                    1552
                    Joined:
                    Feb 23, 2014
                    Location:
                    kenosha,wi
                    Local Time:
                    9:20 AM
                    If you can find them go with shumacher headers, might find some that someone is selling to go to full length headers.
                     
                  • 71GSSDemon

                    71GSSDemon FABO Gold Member FABO Gold Member

                    Messages:
                    3,233
                    Likes Received:
                    4954
                    Joined:
                    Jul 27, 2018
                    Location:
                    Rosendale, WI
                    Local Time:
                    9:20 AM
                    Fenderwell headers are nice and can often find used sets cheap. I got mine for $250 with nice paint on them still.

                    A body big block manifolds...
                     
                  • thesiren74

                    thesiren74 Well-Known Member

                    Messages:
                    1,902
                    Likes Received:
                    1552
                    Joined:
                    Feb 23, 2014
                    Location:
                    kenosha,wi
                    Local Time:
                    9:20 AM
                    Holy hell!!
                     
                  • 71GSSDemon

                    71GSSDemon FABO Gold Member FABO Gold Member

                    Messages:
                    3,233
                    Likes Received:
                    4954
                    Joined:
                    Jul 27, 2018
                    Location:
                    Rosendale, WI
                    Local Time:
                    9:20 AM
                    That is just a local ad. The only set I have seen in a long time. Not many out there for factory big block A Bodies. Personally, I love the fenderwells but you need to cut the car, mine wasn't an issue there. If doing a clean install, I would use B body hp manifolds and cut the column like I mention...or headers.
                     
                    • Like Like x 1
                    • 65Val

                      65Val Average Length Member

                      Messages:
                      5,250
                      Likes Received:
                      1258
                      Joined:
                      Oct 14, 2005
                      Location:
                      Victoria, BC, Canada, EH!
                      Local Time:
                      7:20 AM
                      You could angle-mill the exhaust to head flanges of that C body manifold to gain clearance past obstacles on the drivers side.
                       
                    1. This site uses cookies to help personalize content, tailor your experience and to keep you logged in if you register.
                      By continuing to use this site, you are consenting to our use of cookies.