Dumbest question ever asked!

Small Block Mopar Engine

  1. Silver68GTDart

    Silver68GTDart Active Member

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    You know how it is. Cold in the barn where you store your prized possession. There's work you should be doing on your car but decide to stay in the house where it's warm. Your mind starts to wonder and your thinking of putting a bigger engine in the car. Have been looking for a 360LA with a 727 trans. out of a car, and in Northern Ohio there's not too much to choose from. Here is the question: what is the difference between a 360LA and 3.9 Magnum. Are all the bolt patterns the same ie: head bolt, exhaust manifolds, flywheel (converter) housing, engine mounts, crankshaft bolt pattern, timing cover, distributor bore and any others I can't think of now. Are the physical dimensions the same. I've rebuilt the 273 that's in the car now and have put only about 50 miles on the car since rebuild before winter. May be happy with what I have but Tim The Tool Man and I are on the same page (MORE POWER).
     
  2. Red63440

    Red63440 Olddawg FABO Gold Member

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    You do realize that one is a V8 and the other is a V6 correct, a 3.9 is a 318 with 2 cylinders removed. I'm sure Tim would tell you its all about cubic inches....
     
    Last edited: Nov 29, 2018
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    • Silver68GTDart

      Silver68GTDart Active Member

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      I said it was the dumbest question. I'm looking for a more current 360. What would that be in the Magnum series.
       
    • Silver68GTDart

      Silver68GTDart Active Member

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      Now that I think about it, would that be a 5.9L?
       
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      • tonysrt

        tonysrt FABO Gold Member FABO Gold Member

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        In your original post did you mean difference between 360LA & 5.9 magnum? The advantage to the magnum is that it has roller lifters, not worrying about zinc additive in the oil. Disadvantage is intakes are different and maybe a few other things like serpentine belt for water pump, power steering pump and water pump. You have to decide what's best for you.
         
      • Garry in AZ

        Garry in AZ Building a 9 second Valiant FABO Gold Member

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        Yes, 360 cu.in is approximately 5.9 liters.
         
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        • Darter6

          Darter6 Well-Known Member

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          And a 5.2 magnum is a 318.
           
        • Silver68GTDart

          Silver68GTDart Active Member

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          Ok. But is the bolt pattern on the front of the 5.9 the same as the 360? This would include the bolt holes in the heads If so then I could use everything on the front of my 273 including timing cover, p/s and water pumps and alternator brackets?
           
        • Gdub310

          Gdub310 FABO Gold Member FABO Gold Member

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          Answers to these and many other questions you will have can be found on magnumswap.com: (no title)
           
        • RustyRatRod

          RustyRatRod Weenie idiot loser. FABO Gold Member

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          The same as in the 360 LA. 5.9. The Magnum simply uses the liter measurement to make it sound "more modern". The displacement is the same for both. 360 cubic inches or 5.9 liters.
           
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          • tonysrt

            tonysrt FABO Gold Member FABO Gold Member

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            By the way if you don't know the answer to something it is not the dumbest question. The people on this site that know the answers to a lot of questions is because they have been there and done it. It always pays to ask the question before you commit. An example, I ordered 2 1/ 2 dual exhaust for my 318 Duster. I got the passenger side in no problem. The drivers side I couldn't make fit. I called up the Co. and they said they sent the wrong exhaust pipe. I was tempted to make that pipe fit. So calling and asking questions saved the day.
             
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            • 7milesout

              7milesout Well-Known Member

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              I have it in my mind that the reference to a Liter size of engine came simultaneous to fuel injection. Meaning, a carbureted engine would be called a 360. Where the same (basic) engine modernized with fuel injection is then referred to as a 5.9L. Hence, an LA 360 and a 5.9L Magnum. FWIW.

              And I am the King of dumb questions!
               
            • Silver68GTDart

              Silver68GTDart Active Member

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              Thank you. Have started reading their site. It has a lot of the info I was looking for. Thanks again!
               
            • Silver68GTDart

              Silver68GTDart Active Member

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              Thanks to one and all. May you all have a Merry Christmas.
               
            • tonysrt

              tonysrt FABO Gold Member FABO Gold Member

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              The 5.9 designation was the result of one dumb President saying we are going to convert to the metric system. So all the car Mfgrs. went to metric fasteners on there engines and converted engine displacement to liters. The growing pains of the metric system had cars blowing head gaskets because the engineers didn't know what size fasteners to use.
               
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              • AJ/FormS

                AJ/FormS 68 B'cuda fb, Form S clone ... 367/A833/3.55s

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                Put a turbo on that 4.47 of yours and never look back.
                 
              • 67Dart273

                67Dart273 FABO Gold Member FABO Gold Member

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                One of the biggest changes (I hope I have this right) is the oil pan/ timing cover

                If you are putting a magnum into an A/ B body Mopar you need a front sump pan, here' s the deal as I remember:

                All 273/318/340 pans interchange between those LA engines so far as fitting the block. The sumps are different between various cars and trucks

                The 360 LA is unique due to the smaller "half moon" in the rear around the main bearing

                Magnums use the 360LA "pattern" for BOTH 318 and 360 magnum (5.2/ 5.9) HOWEVER the pan gasket is different LA to magnum, and the TIMING COVER area where the pan seals is different. THAT is important. The LA pan has a couple of bulges where the pan meets the timing cover. If you use a magnum pan gasket with an LA pan, there are two huge gaps created that you must fill with silicone/ other

                If you use the LA timing cover setup, LA pan and gasket, that is avoided. On mine which is NOT installed or run yet, I'm "going to try" using an LA pan, LA timing cover, and Magnum gasket, and fill the gaps

                You cannot bolt an LA intake to a magnum headed engine. The magnum manifold bolts are vertical, the LA intake bolts are "canted" and perpendicular to the block

                If you want to "carb" a stock magnum, you have to buy one of two or three manifolds available for a magnum
                 
              • RustyRatRod

                RustyRatRod Weenie idiot loser. FABO Gold Member

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                The 66 Galaxie 500 sport coupe had this in the grill. And a carburetor.

                7 LITRE.jpg
                 
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                • 67Dart273

                  67Dart273 FABO Gold Member FABO Gold Member

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                  Worst thing about this "liters" horse$hiate is that it is not "convertible" You can't convert liters into CID it is not accurate enough.

                  I once got into a hell of an argument back in the "parts counterman" days when metrics was first showing up in cars. Some woman comes in and starts bla bla bla about how the metric system is "so standardized."

                  I told her "that is not always true. There are different bolt threads commin in different countries just like anything else."

                  "NO NO NO!!! A metric bolt is a metric bolt!!" She raged

                  OK lady. Drive your Jap car to France and then try to buy a bolt to fit it, the French like to use different thread pitches.

                  And plumbing................there IS NO real standardization with plumbing fittings, and worst, "some" are so close to 'Murican 1/8 pipe for stuff like oil pressure that you are "tempted" to just "strip it right in"
                   
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                  • AJ/FormS

                    AJ/FormS 68 B'cuda fb, Form S clone ... 367/A833/3.55s

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                    Up here when Metric first started, we had standard bolts with metric heads. I still have a bucket of those orphans in the shop.
                     
                  • Abodybomber

                    Abodybomber Breaking street machines , since 1983.....:) Legendary Member

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                    Just for reference: 61 cubic inches = 1.0 litre of displacement....
                     
                  • 67Dart273

                    67Dart273 FABO Gold Member FABO Gold Member

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                    "Back then" a Chev line mechanic once wasted some two hours on this. Came into the store, he had already been to our fasteners shop "down the street". He had a bolt with a 10mm head "so he knew" it must be metric. The bolt shop was no help they could not identify it.........because it was metric, and was an odd thread

                    No, boys 'n girls, it was 1/4 USS thread.............with a 10mm head

                    I believe some of the magnums use these on the valve cover studs
                     
                  • 67Dart273

                    67Dart273 FABO Gold Member FABO Gold Member

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                    The problem as I said earlier is that litres are not accurate. If you are truly goiing to "convert" stuff like 302, 305, etc small changes, they need to be in decimal or CC
                     
                  • stixx

                    stixx Well-Known Member

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                    1 litre = 1000cc.
                    Always been like that.
                     
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                    • 1Fast340

                      1Fast340 Well-Known Member

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                      IF that is true,i would not blame metric bolts but rather the clowns who claim to be engineers and cant figure out what boltsize is needed.
                       
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