Hemi hp and tq ?

New Hemi Engine Swaps

  1. 71scamp78

    71scamp78 Well-Known Member

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    Ok I'm debating on building this 5.7 stroked to a 394 with a kit from MMX. It's a 2014 block with stock eagle heads and will be carbureted. Just curious what power output you think it will make. Intake I was thinking of the OCP dual plane. Thinking of building for my GTX because I sold Dart I was going to put it in. Currently I have a 440 in my 69 GTX with a 4 speed dana 60 and 4.10 gears. If not building this was thinking of doing a 440 with some trick flow heads. Here is the cam specs for the Hemi.

    20211107_165451.jpg
     
  2. 70chall440

    70chall440 Mopar or No Car...

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    I suspect you will get varied responses ranging from "keep it old school" to "upgrade to the G3 Hemi". I fall into the second camp, I would drop a G3 into it in a heartbeat and enjoy the crap out it. Sure, to many a G3 doesn't look as cool as the OS 440, and it is not a super simple or super cheap swap, but what you get back in reliability, drivabilty, and yes durability it worth the effort IMHO.
     
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    • TT5.9mag

      TT5.9mag Two atmospheres are better than one

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      Depends on what YOU like and what YOU want out of your car. A gen3 hemi stroked, carbureted, with eagle heads should make ~420 to answer your question.
       
    • 71scamp78

      71scamp78 Well-Known Member

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      420 ? A stock 6.4 makes 485 hp. My cam is way bigger , plus headers. I'm thinking 575 hp
       
    • TT5.9mag

      TT5.9mag Two atmospheres are better than one

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      The carb intakes suck.
       
    • thesiren74

      thesiren74 Well-Known Member

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      It's going to make way more than 420hp.
       
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      • thesiren74

        thesiren74 Well-Known Member

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        I would think 500+ easy
         
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        • thesiren74

          thesiren74 Well-Known Member

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          Those 5.7l heads flow over 300 cfm stock and what do trickflow non cnc flow?
           
        • TT5.9mag

          TT5.9mag Two atmospheres are better than one

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          2478F3FE-91D9-402B-B874-1EFBE25AEDF2.png
          Stock 5.7 hemi with long tube headers, still fuel injected. If you guys think there is 150+ hp with a cam swap and going back to a carburetor you need to think again. The stroke will help a little.
           
        • TT5.9mag

          TT5.9mag Two atmospheres are better than one

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          Can you make 575? Sure. But you’ll need a little more than a cam swap
           
        • thesiren74

          thesiren74 Well-Known Member

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          Stroke will help a lot! Take advantage of those cylinder heads and cam.
           
        • TT5.9mag

          TT5.9mag Two atmospheres are better than one

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          19AAD183-149C-4A2C-B7A2-E73ACC2F2B1E.png
          Cam swap.
           
        • TT5.9mag

          TT5.9mag Two atmospheres are better than one

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          You know what helps “a lot”?
          Turbos.
           
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          • DionR

            DionR Well-Known Member

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          • thesiren74

            thesiren74 Well-Known Member

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            Screenshot_20211124-114410_MotorTrend.jpg
            I know it's got the variable intake and tuning but still it's a stock bottom end 5.7l.
             
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            • TT5.9mag

              TT5.9mag Two atmospheres are better than one

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              That’s a Richard Holdener test and all he said was it’s a Comp HRT cam. He gave no specs.
               
            • TT5.9mag

              TT5.9mag Two atmospheres are better than one

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              That variable valve intake manifold is surprisingly good.
               
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              • 71scamp78

                71scamp78 Well-Known Member

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                If a stock 392 makes 485 I'm sure with what I'm building it should make 550 at least. Hell I seen a stroked 360 make over 600 with ported eddy heads. Maybe I should just keep it old school and run a 440 with some good aluminum heads..that big block torque is sweet..maybe a low deck 500 ci stroker idk..
                 
              • TT5.9mag

                TT5.9mag Two atmospheres are better than one

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                What do you want? A driver? A race car? 550hp is easily achievable but you should give us a clue what you’re trying to do. The example you gave above, probably does not run on 87 octane and pull 18” of vacuum so let’s call that “not a daily driver”. Then you say “big block torque” which makes me think street car. So what kinda car are we building here?
                 
              • 71scamp78

                71scamp78 Well-Known Member

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                69 gts 4 speed. Street mostly so maybe a good low deck torque monster may be better
                 
              • TT5.9mag

                TT5.9mag Two atmospheres are better than one

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                The low deck 451s are great and make great power and torque. But don’t sell the gen3 short, look at the cam swap graph I posted above. It makes over 400lb/ft from 3400 to 5700. That’ll move just about any street car pretty well. And would be a lot of fun with a 4 speed and 4:10s. And I’m sure you’ll save some weight over the big block.
                 
              • 408 swinger

                408 swinger FABO Gold Member FABO Gold Member

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              • TT5.9mag

                TT5.9mag Two atmospheres are better than one

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                That’s a stout gen 3, I looked for the cam specs on the HUG SER2731MHLN
                But couldnt find them. Just to note, it took “fully cnc ported” heads and a cam swap with dual 1000cfm throttle bodies on Holley hp efi to get to 529hp. I’d love to know what compression it is.
                 
                Last edited: Nov 24, 2021
              • TT5.9mag

                TT5.9mag Two atmospheres are better than one

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              • 408 swinger

                408 swinger FABO Gold Member FABO Gold Member

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                I would guess 11ish. Hughes likes cylinder pressure.
                 
              • TT5.9mag

                TT5.9mag Two atmospheres are better than one

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                Agree. It does say “runs happily on pump gas”.
                 
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