360 Magnum engine

Mopar Racers Forum

  1. Ceedawg

    Ceedawg Well-Known Member

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    About finished with my 70 Duster E/stock. 340 is not ready yet so I'm using my 360 that I built as a 360-380 and wondering what the rpm limit is. I used the factory port templates and has the 1.7 roller rockers kit. M1 intake/race Q-jet. Basically to know what gear in the Dana. Thanks
    Mike
     
  2. Abodybomber

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

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    Converter stall ,transmission and rear tire height...?
     
  3. Ceedawg

    Ceedawg Well-Known Member

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    92.5" roll out 9x30 904 Dynamic 8" 4800?
     
  4. Ceedawg

    Ceedawg Well-Known Member

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    Really, nobody on here knows what the rpm level of a 360 is? I've never ran a small block before so I don't know when these Magnum heads start laying over.
     
  5. Jadaharabi

    Jadaharabi FABO Gold Member FABO Gold Member

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    I have 4.88s with 29.5 inch tires, in my 73/74 Duster stocker that's not all together at the moment. The 360 is 75% together and the 340 is totally apart and needs assembled.

    What Dana do you have under yours?
     
  6. dadodgekid

    dadodgekid When in doubt... floor it

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    it will be all over at 6200 -6400 if it still has the 380HP crate motor cam. (.508 roller i believe)
     
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    • RustyRatRod

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

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      If it has a decent HP lifter in it, it might pull to 6500.
       
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      • Walker434

        Walker434 Well-Known Member

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        Mine starts laying over at 6,000. I've turned up to 6,300 and always slowed down past 6,000.
         
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        • Ceedawg

          Ceedawg Well-Known Member

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          Dana 60, I have 4.88 5.13 5.38 5.57 don't know whitch one to use yet. Might look for 4.56 at Carlisle. I'm leaning to the 4.88 with the 360.
           
        • furrystump

          furrystump Well-Known Member

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          All done 6000-6300 is my guess.
           
        • Jadaharabi

          Jadaharabi FABO Gold Member FABO Gold Member

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          Was wondering if you had a car dana or a converted truck one.

          Ask physixx what he uses in his stocker.

          His avatar sez it all
          981.jpg
           
          Last edited: Jul 10, 2018
        • Ceedawg

          Ceedawg Well-Known Member

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          Yes that one, 6000 will give a good idea on gear. I'll use the 5.13 for the 340. Thanks to all for the input
          Mike
           
        • dadodgekid

          dadodgekid When in doubt... floor it

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          4.88 should be about right with the 30" tire with the 4800ish stall and the 360.
           
        • 273

          273 Well-Known Member

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          Screenshot_20171212-084647.png

          Heres a dyno of the 380 hp create engine if that helps.
           
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          • Ceedawg

            Ceedawg Well-Known Member

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            5800 is tops then for the out of box engine, wonder is it cam or head airflow holding it back?
            I did the bowl work with the 1.7 rockers, maybe more? May do a little more since I now have the guide and seat machine, flow bench is in the works, need to get that finished.
            Thanks for info
             
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            • Ceedawg

              Ceedawg Well-Known Member

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              Is there really a difference?
               
            • 273

              273 Well-Known Member

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              Screenshot_20171212-101519.png
              Well heres a dyno of a 300 hp create vs a top end change to a comp roller 275 airgap and eddy heads. Your mods might be closer to that one.
               
            • Ceedawg

              Ceedawg Well-Known Member

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              According to the Wallace thingy, I might need the 4.56 gear
               
            • Jadaharabi

              Jadaharabi FABO Gold Member FABO Gold Member

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              Unless they changed the rules for rear ends in stock Eliminator. You are not allowed to use a truck rear end.
              The way to tell the difference between the truck and the car rear end is the truck rear end does not have the mount for a pinion snubber.
              Don't quote me on that but that was my understanding of the rules.
               
            • Ceedawg

              Ceedawg Well-Known Member

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              I think when they say no truck rears they mean no floating hubs (8 lug wheels), might be wrong. Especially since there was no production Dana for an a-body.
               
            • 70aarcuda

              70aarcuda Master Hoader of SBM FABO Gold Member

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              Sorry had to quote you...Stockers around here are all using Dana 60s.....which can be ordered with or without provisions for pinion snubber...and I would say,,,,99,999% of the stockers use Cal Tracs which probably means they do not use pionion snubber...
               
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              • Ceedawg

                Ceedawg Well-Known Member

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                What rpm are you turning in those 3 cars? Are they cast cranks?
                 
              • ddartdude

                ddartdude Well-Known Member

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                If it's a true Magnum engine, I hope you used the correct type of weighted torque converter.
                 
              • Jadaharabi

                Jadaharabi FABO Gold Member FABO Gold Member

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                I thought the rules said that you had to use a factory manufactured rear end from the factory that was made for a car.
                Which to me would mean a Dana that was manufactured for a b-body or an e body or station wagon that had been narrow to fit the a body. Or the a body Dana that direct connection made.
                But if what you say is true I already have a 52 and 5/8 Dana that I could shove under mine. I would rather have the Dana than the eight three quarter even though I'm running a 904 with 8 inch converter with the low gear set in the 904.
                I have slide-a-links.
                 
                Last edited: Jul 11, 2018
              • 70aarcuda

                70aarcuda Master Hoader of SBM FABO Gold Member

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                the stock stroke 360 are cast cranks...at sea level 7200 thru the traps....in Vegas 6800 ish...

                not using heavy pistons or heavy stock rods....
                 
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