318 - Magnum Engine Swap

Magnum Engine Swaps

  1. dICKj

    dICKj Well-Known Member

    Messages:
    84
    Likes Received:
    64
    Joined:
    Sep 25, 2018
    Location:
    Kilgore, TX
    Local Time:
    12:06 PM
    In a 1974 Duster:
    1. Do I need special motor mounts to put a Magnum 360 in where a 318 came out?
    2. Will the Magnum bolt up to the original 904 auto transmission?
    3. What year did Magnums go from Carburetors to Fuel Injection?

    Thanks, DickJ
     
  2. dICKj

    dICKj Well-Known Member

    Messages:
    84
    Likes Received:
    64
    Joined:
    Sep 25, 2018
    Location:
    Kilgore, TX
    Local Time:
    12:06 PM
    Would a 360 LA be an easier swap? DickJ
     
  3. Magnum Valiant

    Magnum Valiant Well-Known Member

    Messages:
    98
    Likes Received:
    61
    Joined:
    Mar 14, 2020
    Location:
    United States
    Local Time:
    1:06 PM
    Can only answer 3. All Magnum were fuel injection.
     
  4. 318willrun

    318willrun Utube channel 318willrun

    Messages:
    17,928
    Likes Received:
    20453
    Joined:
    Sep 13, 2013
    Location:
    I'm here
    Local Time:
    12:06 PM
    • you can use the 318 mounts on a 360, but will need spacers for the one side where it bolts to the engine..
    • yes, the 360's will bolt to the original 904. You'll need the right flexplate or converter. If 5.9 magnum and later than '96, just use the flex plate it came with for balancing. One hole will need a little ovaling. If using a 318 Magnum, no worries.
    • All magnums were FI. In fact, all LA small blocks were TBI in the last few years. There are carb intakes that fit
    • You'll need a car 360 oil pan and pickup tube
    • Your 318 timing cover, water pump and pulleys fit the magnums. You'll need the correct harmonic balancer for the 5.9
     
    • Agree Agree x 1
    • dICKj

      dICKj Well-Known Member

      Messages:
      84
      Likes Received:
      64
      Joined:
      Sep 25, 2018
      Location:
      Kilgore, TX
      Local Time:
      12:06 PM
      Wont the oil pan and pickup off of 318 fit the LA 360?
       
    • missing linc

      missing linc Loose nut behind the wheel

      Messages:
      4,311
      Likes Received:
      8106
      Joined:
      Feb 17, 2019
      Location:
      Southern Alberta Canada
      Local Time:
      11:06 AM
      No.
       
    • 318willrun

      318willrun Utube channel 318willrun

      Messages:
      17,928
      Likes Received:
      20453
      Joined:
      Sep 13, 2013
      Location:
      I'm here
      Local Time:
      12:06 PM
      no
       
    • TT5.9mag

      TT5.9mag Two atmospheres are better than one

      Messages:
      1,785
      Likes Received:
      1774
      Joined:
      May 5, 2016
      Location:
      So cal
      Local Time:
      10:06 AM
      Adding to what @318willrun said;

      If you plan to use the fuel injection you’ll have to notch the top of the bellhousing on the 904 to clear the crankshaft position sensor when you bolt it up.
       
      • Agree Agree x 1
      • 318willrun

        318willrun Utube channel 318willrun

        Messages:
        17,928
        Likes Received:
        20453
        Joined:
        Sep 13, 2013
        Location:
        I'm here
        Local Time:
        12:06 PM
        Further more, the magnums don't have the provision on the cam snout for the fuel pump eccentric if you are going to run a mechanical pump. You can buy an adapting unit from Hughes for like 30 bucks, or if you cam swap you can use a roller cam with a long snout. Of course, if using an electric fuel pump, no worries.
         
      • dICKj

        dICKj Well-Known Member

        Messages:
        84
        Likes Received:
        64
        Joined:
        Sep 25, 2018
        Location:
        Kilgore, TX
        Local Time:
        12:06 PM
        No to fuel injection. lt sounds like a 360 LA is the easier way to go.
         
      • 67dartgtgo

        67dartgtgo FABO Gold Member FABO Gold Member

        Messages:
        1,477
        Likes Received:
        916
        Joined:
        Nov 9, 2012
        Location:
        Mass
        Local Time:
        12:06 PM
        • Agree Agree x 4
        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.