Mild 360 Magnum Build

Small Block Mopar Engine

  1. RAMM

    RAMM Well-Known Member

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    I certainly wouldn't mind if you reported on all of them. When do you think results will be in for them? J.Rob
     
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    • 67autocross

      67autocross A new iron curtain drawn across the 49th parallel

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      They are all getting done in the next 10 days. They just did a stock bore 340 … they claimed all 8 cylinders were sleeves that made 419 hp
       
    • RAMM

      RAMM Well-Known Member

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      Sounds good to me. Thanks, J.Rob
       
    • 67autocross

      67autocross A new iron curtain drawn across the 49th parallel

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      Okay it’s on the Dyno…. We will spin it Wednesday evening… let the horse power torque guessing being….

      0018D5FB-C23B-4B9A-A0C7-A33B0BE4257F.jpeg
       
    • AustinGriggs

      AustinGriggs Well-Known Member

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      Solid set up it seems, compression looks like a touch over 9:1 and that cam is going to have great low-end torque, those heads look to flow better than I'd expect. I think you will out do your goal of 375 hp, my guess is 386, but the real story is in the torque I think you will put down something like.... 447. So thats my guess 386HP/447TQ. Good Luck!
       
    • EddieSketti

      EddieSketti FABO Gold Member FABO Gold Member

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      When going to a magnum style iron head EQ's are the shit !!
       
    • 67autocross

      67autocross A new iron curtain drawn across the 49th parallel

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      My buddy that put it together with me thinks 375hp… the guy who owns the dyno says with how good the heads flow it might go 400hp.
      I’m using my 750 AED carb as the dyno shop has sold every carb they have including the 650 vac we were originally planned on using
       
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      • 67autocross

        67autocross A new iron curtain drawn across the 49th parallel

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        The numbers are in…. Any last guesses?

        92E81263-C2AC-4FD0-9DEC-FC3BC01CE7D8.jpeg
         
      • ir3333

        ir3333 Well-Known Member

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        can you list all the build specs..i got lost after 150 posts
         
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        • rumblefish360

          rumblefish360 So close, yet so far away FABO Gold Member

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          Definitely!
           
        • 67autocross

          67autocross A new iron curtain drawn across the 49th parallel

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          360 magnum block.
          Stock crank cut 10 thou.
          Stock rods with ARP bolts.
          30 over rebuilder box pistons, block decked so pistons are 50 thou down same as stock.
          Cam is a lunati replacement roller
          Advertised duration 276 in 284 ex
          Duration at .050 210 in 218 ex
          LSA 112/106
          Rpm range 1200-5200
          Cam was recommended by Jesse( J.Rob )on this site after I gave him the specs and intended use so I want to give him a big thanks for this!

          Top end is EQ magnum heads
          Valves are Chevy LS long 202 in 160 ext
          Stock rockers with custom stands to lift them for the long valves.
          Heads are blow ported with a bit of intake runner work, flow around 275 in and 190 ex at 500 lift.
          Air gap dual plain intake
          Mopar performance distributor
          Ran my 750 AED carb
          Add 1 inch spacer for the last pull
          Did no carb jetting
          39 degrees of timing…could have gone more as it picked up power ever time we added some…but I already was where I wanted to be
           
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          • James Clews

            James Clews Well-Known Member

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            421 HP
             
          • JoePole1

            JoePole1 A dude in a B body FABO Gold Member

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            385/430
             
          • 12many

            12many Well-Known Member

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          • 67autocross

            67autocross A new iron curtain drawn across the 49th parallel

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            Best pull torque was 460 ft at 3800 rpm and 410 hp at 5100rpm….

            C82A25F0-FB5B-4A4F-9208-84AD2294865E.jpeg
             
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            • ir3333

              ir3333 Well-Known Member

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              well done!I'm surprised.
              ...superior to Mopar's 380 hp 360 crate engine with a smaller cam?
               
            • 67autocross

              67autocross A new iron curtain drawn across the 49th parallel

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              The cam is tiny…. It was pulling 20 inches on the vacuum gauge

              EC1DF9F9-3CA1-48FA-9C28-5C5D9430666B.jpeg
               
            • RAMM

              RAMM Well-Known Member

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              That is going to work well in anything you put it in. Well done. Wish I could find a set of EQ's from the TooWoomba foundry, not wherever they're from now. J.Rob
               
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              • RAMM

                RAMM Well-Known Member

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                The cam Mopar used along with the single plane manifold really didn't compliment the unported Magnum cylinder heads especially with the low compression. They really didn't spend much time developing that I don't think. J.Rob
                 
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                • 75slant6

                  75slant6 Well-Known Member

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                  That’s impressive and exciting! I have a set of speedmaster aluminum heads to go on my stock 5.9 bottom end and have been filing away cam options the past couple months. This excites me for what I might be able to get out of my engine then!
                   
                • DMC_78

                  DMC_78 Member

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                  Thanks so much for sharing! I will be starting a build just like this very soon. I have the same heads as you, and have been on the fence about what pistons to use.

                  do you know your cranking pressure in the cylinders?
                  What octane did you run, and what do you plan on running the engine with? I am also in Canada, and limited to 91 at best.

                  thanks again for sharing!
                   
                • 67autocross

                  67autocross A new iron curtain drawn across the 49th parallel

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                  It had Co-op 91 in it only because they had another engine to do the next morning and it would save draining the tank...we did no tuning other other than timing and I know it could have went well over 40 degrees and made more power...made 400hp with no spacer and a rich A/F reading...stuck the carb spacer on it which leaned out a bit and went 410hp...and we left the shop...total time on the dyno was under 1 hour
                   
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                  • LowDeck451

                    LowDeck451 Well-Known Member

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                    Great job! What a sweet engine. I heard or read somewhere that the EQs and the Indy Xs aren’t available anymore? Is that true? That’s a shame if it is.
                     
                  • 67autocross

                    67autocross A new iron curtain drawn across the 49th parallel

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                    I don’t think you can get the original EQs anymore…I did see some new ones about 6 months ago and they are not the same castings
                     
                  • 67autocross

                    67autocross A new iron curtain drawn across the 49th parallel

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