Magnum Swap with Carb

Magnum Engine Swaps

  1. MoparLeo

    MoparLeo NRA PATRON LEVEL LIFE MEMBER FABO Gold Member

    Messages:
    572
    Likes Received:
    346
    Joined:
    Feb 10, 2016
    Location:
    Moreno Valley, Cal. So. Cal.
    Local Time:
    10:36 AM
    The book says it "dyno tested" 300+ . Gross or net ???
     
  2. RustyRatRod

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

    Messages:
    65,725
    Likes Received:
    39023
    Joined:
    Jun 7, 2010
    Location:
    Georgia
    Local Time:
    1:36 PM
    If he leaves it stock,. I agree with your carburetor assessment.
     
  3. YY1

    YY1 Well-Known Member

    Messages:
    7,110
    Likes Received:
    2787
    Joined:
    Oct 11, 2011
    Location:
    FL
    Local Time:
    1:36 PM
    The 300 HP (gross) crate 360 is the 245 net HP stock magnum 5.9
     
    • Agree Agree x 2
    • replicaracer43

      replicaracer43 Grumpy Old Man

      Messages:
      4,482
      Likes Received:
      3480
      Joined:
      Oct 10, 2008
      Local Time:
      12:36 PM
      The 300 hp crate is a stock truck long block, cam and all, with a intake swap. The 380 hp crate is the same long block with a single plane intake, a bigger cam, and different valve springs.
       
    • moparmarks

      moparmarks zippindippintie FABO Gold Member

      Messages:
      1,282
      Likes Received:
      648
      Joined:
      Oct 5, 2014
      Location:
      Western Colorado
      Local Time:
      11:36 AM
      Why do they not recommend using the factory MPI or AC if it is just a stock motor?
      I wanted to use one in my Dakota but didn't because of this statement.
       
    • replicaracer43

      replicaracer43 Grumpy Old Man

      Messages:
      4,482
      Likes Received:
      3480
      Joined:
      Oct 10, 2008
      Local Time:
      12:36 PM
      Because it's being sold as a "performance" replacement engine. The 300 hp version could easily use the factory efi and a/c. The 380 horse version could not
       
    • moparmarks

      moparmarks zippindippintie FABO Gold Member

      Messages:
      1,282
      Likes Received:
      648
      Joined:
      Oct 5, 2014
      Location:
      Western Colorado
      Local Time:
      11:36 AM
      Well poop. Pretty misleading of them.
       
      • Agree Agree x 1
      • rumblefish360

        rumblefish360 So close, yet so far away FABO Gold Member

        Messages:
        39,340
        Likes Received:
        10883
        Joined:
        Jun 21, 2005
        Location:
        New York, on a Island
        Local Time:
        1:36 PM
        True, it is a gross rating. Just basic changes on the engine. The typical beginner bolt on hot rod parts.

        Does it suck that you can’t get the MP bump stick anymore?

        At the flywheel.
        What I did at the bottom.....

        Pretty cool what a few bolt on parts do huh?
        Good question. I wonder if it is an intake manifold fitting issue? That it interferes with the A/C bracket? Magnum style A/C issue? I think that’s it. Not so much the LA brackets.

        @Haney I plucked out a ‘00, Durango 5.9 for my ‘79 Magnum. Backed it with a 727 & 3.55 gears on 27 inch tires. What I did to the engine was;

        Installed a RPM & a 600 AFB carb w/a ‘72 trap door air cleaner housing a K&N filter.
        Junk yard distributor fired by a MP Chrome box.
        Hooker Super Competition 1-3/4 Headers into a 2-1/2 exhaust to the bumper. The 1-5/8 provides a little more torque for this particular application and I just used what I had on hand.

        The car is a good bit lighter, just under 3800lbs. vs what ever your truck weighs in at. So when it comes to a cam, I would keep it small for the added torque your looking for. You will not need a big lift. Just another 10*’s of duration is all you’ll need.

        If this was my situation that your in, besides the above of what I did, I would certainly select a Hyd. roller cam for a simple replacement swap. The cam itself is a tick over $300, but you reuse everything else. (Perhaps not the valve springs....) Though a new timing chain and chain tensioner would also come with the cam since your all ready there. You might as well!

        I found the (‘00) Magnum in my (‘79) Magnum a really nice power plant. Very torquey &
        with good HP for a strictly street bound daily driver.
        The 600 cfm carb was IMO an excellent match with really good pedal response and road manors. I’m sure a 750 would work. But I have seen no need for it unless I would be spending more time upstairs in the rpm range. Which is done early with the factory cam.

        I didn’t have the flex plate. I used a B&M flex plate to mate to the neutral balance converter. I also used Lokar cables for the throttle and trans kick down.
         
      • YY1

        YY1 Well-Known Member

        Messages:
        7,110
        Likes Received:
        2787
        Joined:
        Oct 11, 2011
        Location:
        FL
        Local Time:
        1:36 PM
        Pretty sure the 380 could to, unless the design of the intake prevented it, which may also be the issue with the 300 version.
         
      • rumblefish360

        rumblefish360 So close, yet so far away FABO Gold Member

        Messages:
        39,340
        Likes Received:
        10883
        Joined:
        Jun 21, 2005
        Location:
        New York, on a Island
        Local Time:
        1:36 PM
        The 380 used the MP single plane. I never noticed an A/C set up with that intake.
         
      • moparmarks

        moparmarks zippindippintie FABO Gold Member

        Messages:
        1,282
        Likes Received:
        648
        Joined:
        Oct 5, 2014
        Location:
        Western Colorado
        Local Time:
        11:36 AM
        Edelbrock made 2 dual plain manifolds with the same part number. One has the bosses for the factory a/c and one doesn't. I also have a MI single plain manifold with the bosses.
        Also their ratings are with 1-5/8" headers and 750 carb.
         
      • moparmarks

        moparmarks zippindippintie FABO Gold Member

        Messages:
        1,282
        Likes Received:
        648
        Joined:
        Oct 5, 2014
        Location:
        Western Colorado
        Local Time:
        11:36 AM
        I checked into this cause I want to put the factory Magnum a/c, alt, and belt setup on my 5.9 in my Dart. My MI dual plain doesn't have the bosses needed the mount the factory brackets.
         
        • Like Like x 1
        • rumblefish360

          rumblefish360 So close, yet so far away FABO Gold Member

          Messages:
          39,340
          Likes Received:
          10883
          Joined:
          Jun 21, 2005
          Location:
          New York, on a Island
          Local Time:
          1:36 PM
          There ya go! Thanks Mark. I figured that was the case.
           
        • moparmarks

          moparmarks zippindippintie FABO Gold Member

          Messages:
          1,282
          Likes Received:
          648
          Joined:
          Oct 5, 2014
          Location:
          Western Colorado
          Local Time:
          11:36 AM
          Still think this was misleading of them. You could put the kagger intake on it and that would have everything for the factory MPI and A/C.
           
        • rumblefish360

          rumblefish360 So close, yet so far away FABO Gold Member

          Messages:
          39,340
          Likes Received:
          10883
          Joined:
          Jun 21, 2005
          Location:
          New York, on a Island
          Local Time:
          1:36 PM
          Perhaps... the factory / MP will make such statements to avoid things. It’s easier on there wallet to print a disclaimer rather than defend a frivolous law suits from dumb asses.
           
          • Agree Agree x 2
          • Jadaharabi

            Jadaharabi FABO Gold Member FABO Gold Member

            Messages:
            7,865
            Likes Received:
            8661
            Joined:
            Jan 8, 2016
            Location:
            Peoria, Illinois
            Local Time:
            12:36 PM

            Could you look through that catalog and find out the part number for the valve springs that was used in that 380 horse motor?

            Does it suck that you can’t get the MP bump stick anymore?


            I don't know if it sucks or not. I already have a 512 lift roller that I need springs for.
             
          • rumblefish360

            rumblefish360 So close, yet so far away FABO Gold Member

            Messages:
            39,340
            Likes Received:
            10883
            Joined:
            Jun 21, 2005
            Location:
            New York, on a Island
            Local Time:
            1:36 PM
            Hummm, I wonder if the valve spring is also in the MP book so you can find out the pressures of them. Or just call someone. Grab an aftermarket PAC spring.
             
          • replicaracer43

            replicaracer43 Grumpy Old Man

            Messages:
            4,482
            Likes Received:
            3480
            Joined:
            Oct 10, 2008
            Local Time:
            12:36 PM
            PAC beehives would be my choice, should be something available in the pressures required for the cam.
             
          • Haney

            Haney www.carsonandironmt.com FABO Gold Member

            Messages:
            429
            Likes Received:
            60
            Joined:
            Jan 14, 2005
            Location:
            Piney Flats, Tennessee
            Local Time:
            1:36 PM
            Great first hand info! Thank you @rumblefish360 !
             
            • Like Like x 1
            • Haney

              Haney www.carsonandironmt.com FABO Gold Member

              Messages:
              429
              Likes Received:
              60
              Joined:
              Jan 14, 2005
              Location:
              Piney Flats, Tennessee
              Local Time:
              1:36 PM
              @rumblefish360 Thank you for sharing the experiences with your magnum!!
               
              • Thanks! Thanks! x 1
              • Haney

                Haney www.carsonandironmt.com FABO Gold Member

                Messages:
                429
                Likes Received:
                60
                Joined:
                Jan 14, 2005
                Location:
                Piney Flats, Tennessee
                Local Time:
                1:36 PM
                Anybody know the cam specs for a factory 1998 5.9?
                 
              • Stephen Hotz

                Stephen Hotz FABO Gold Member FABO Gold Member

                Messages:
                2,947
                Likes Received:
                2901
                Joined:
                Dec 30, 2017
                Location:
                New Braunfels, Tx
                Local Time:
                12:36 PM
                Stock 5.2 Magnum: Duration: 251In./264Ex. Lift: .432"In/ .432"Ex Cam centerline 113*

                Stock 5.9 Magnum: Duration: 249In./269Ex. Lift: .410"In/ .417"Ex Cam centerline 109*
                 
                • Like Like x 1
                • Haney

                  Haney www.carsonandironmt.com FABO Gold Member

                  Messages:
                  429
                  Likes Received:
                  60
                  Joined:
                  Jan 14, 2005
                  Location:
                  Piney Flats, Tennessee
                  Local Time:
                  1:36 PM
                  Thank you! Any idea what these durations are @0.050?
                   
                • Stephen Hotz

                  Stephen Hotz FABO Gold Member FABO Gold Member

                  Messages:
                  2,947
                  Likes Received:
                  2901
                  Joined:
                  Dec 30, 2017
                  Location:
                  New Braunfels, Tx
                  Local Time:
                  12:36 PM
                  Not sure. I just happened to have the above #'s bookmarked.
                   
                  • Thanks! Thanks! x 1
                  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.