drilling magnum heads

Magnum Engine Swaps

  1. rbkt65

    rbkt65 FABO Gold Member FABO Gold Member

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    probably this post will get moved but oh well. is it feasible to bolt a dual pattern carb magnum intake to the magnum heads and THEN drill the la holes for an la intake? please point out what might be wrong in my thought process other than just saying no, won't work. thought on this is that la intakes are cheaper than the mag carb ones and more choices.
     
  2. pishta

    pishta I know I'm right....

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    Sure, as using it as a guide? No problem. Have a sharp bit and make sure you got the meat for it. The "Magnum jig" was just a series of drill guides on a bolt on fixture.
    100_0339-jpg.jpg
     
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    • Professor Fate

      Professor Fate Push the button, Max...

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      As far as using the manifold as a guide, I have no idea how you'd ever be able to do the LA center four holes...

      1-147-028.jpg
       
    • Bobzilla

      Bobzilla Well-Known Member

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      You would not use the intake as a drill guide. You can use it to locate and mark the LA holes, then you would drill the holes using a drill press or very careful hand drilling.
      The holes in the dual pattern intake are too large to use as a drill guide.
      I am considering doing this myself but I just laid the LA gasket over the intake and coolant ports, center marked each LA bolt hole with a fine tip marker, and then laid the intake in place with gaskets and verified the holes line up with my marks. I have not actually drilled it yet.

      Edited to add:
      The jig shown in post 2 is the best idea for doing multiple sets of heads. But for just one set, mark it and drill it carefully.
       
    • Bobzilla

      Bobzilla Well-Known Member

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      A short pen, pencil, or even a nail or scribe will still mark these holes accurately enough for drilling. You cannot use the intake itself as a drill guide anyways.
       
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      • Professor Fate

        Professor Fate Push the button, Max...

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        Yeah, that's kinda what I was getting at... :)
         
      • JDMopar

        JDMopar Well-Known Member

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        @Stephen Hotz made a jig, and is kind enough to let it float around for other members to drill LA pattern into their Magnum heads!
        :thumbsup::thumbsup:
         
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        • macdrew77

          macdrew77 Well-Known Member

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          Do you have a spare LA head and a welder? Jig is fairly simple to make. I drilled my mag head for 5/16-18 and both bolt patterns are useable actually.
           
        • Stephen Hotz

          Stephen Hotz Youtube channel Stephen Hotz FABO Gold Member

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          Not sure currently where the plates are but should still be out there.
           
        • 67Dart273

          67Dart273 FABO Gold Member FABO Gold Member

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          YOU sir are a TRUSTING soul!!!
           
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          • RustyRatRod

            RustyRatRod I was born on a Monday. Not last Monday. FABO Gold Member

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            Yup. He and his family are FINE people. They give hope for the future.
             
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            • JDMopar

              JDMopar Well-Known Member

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              Looks like @fastnos used them last, and has them packed, wrapped, and ready to ship to the next person who wants to use them.
              :thumbsup:
               
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              • fastnos

                fastnos Jack of all trades, Master of none! FABO Gold Member

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                Ive got them, and they are wrapped in original packaging+, and ready to go..
                Just need a name and address...
                 
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                • naji408

                  naji408 Well-Known Member

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                  Is there a list to get on? I would love to get them.
                   
                • 540Valiant

                  540Valiant FABO Gold Member FABO Gold Member

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                  I would also like to use it, I would gladly pay to rent it. Thanks ...Shane
                   
                • Barracuda2015

                  Barracuda2015 New Member

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                  I would also like to get on the list for the jig. Be glad to pay shipping. Thanks.
                   
                • fastnos

                  fastnos Jack of all trades, Master of none! FABO Gold Member

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                  In the meantime, Naji408 requested the Jig. Was stuck at work till after the P.O? Closed and didnt get them mail out fast enough. He found a machine shop local to his location and had them complete the machine work. So had them for a bit longer.. next person requested the use of them, so I delivered them personally, and got to meet another ForAbody member!

                  The Jig was delivered to 540 Valiant just recently. Maybe a quick note from next in line, (with address) so when he's done, he can send the package out.
                  Maybe if someone has a little extra time after using, they could make anotther setup, with a few upgrades/tweaks that they thought of. That way, there could be a couple sets out there that could be borrowed/making the rounds!
                  (Kinda the same like loan a tool at AutoZone)
                   
                  Last edited: Jul 31, 2021
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                  • Keystone

                    Keystone Well-Known Member

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                    Bumping this thread as it's apparently the current one for tracking the whereabouts of the drilling fixture. I contacted 540Valiant and he's about ready to send it to someone after him (I'm guessing Barracuda2015) and I'm requesting it after that. I'll post back when it's ready to send on to the next member.
                     
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                    • fastnos

                      fastnos Jack of all trades, Master of none! FABO Gold Member

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                      On a lil different note, it was nice to look at the packaging and see where the package had been before. That setup is getting a lot of miles on it!
                       
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