difference between 383 and 383 hp engine

Engine, Trans & Driveline

  1. moparnorth

    moparnorth Well-Known Member

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    difference between 383 and 383 hp engine from a 69 Road Runner or 70 coronet with 383 hp and 727 tranny
     
    Last edited: Nov 28, 2021
  2. 1968rt

    1968rt Well-Known Member

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    Exhaust manifolds, cam, springs and carb

    cam specs.JPG cam specs2.JPG
     
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    • moes

      moes Well-Known Member

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      camshaft, valve springs, windage tray and different carb.
       
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      • moparnorth

        moparnorth Well-Known Member

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      • moparnorth

        moparnorth Well-Known Member

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        does anyone know the model number for the carb
         
      • 33 IMP

        33 IMP FBBO Gold Member FBBO Gold Member

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        Engine code on fender tag.....
        925- Carter 4615 avs
        926- Carter 4682 avs
        897- Carter 4711
        899- Holley R4440
        First two are orange, stamped HP
        Last two are 330hp version, and turquoise.
         
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        • Curiousyellow71

          Curiousyellow71 Well-Known Member

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          Exhaust Manifolds are the same if they are 4 barrel engines.
           
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          • moes

            moes Well-Known Member

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            Exhaust Manifolds are the same if they are 4 barrel engines.

            yep, the 330 and 335 motors had the same exhaust manifolds

            70_Barracuda0014.jpg
             
          • R413

            R413 Well-Known Member

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            He is asking the difference between a 69 RR 383HP engine and a 70 Coronet 383

            So there are plenty of differences. Exhaust manifolds are both different. Intake, carb, air cleaner, distributor, valve covers. Compression ratio is lower in 1970 so different pistons.

            D0930283-35FE-4E8B-9D1B-346F99A15811.jpeg 82BA52BC-D5FE-48F9-9063-4E21F9CA08FB.jpeg
             
          • Cranky

            Cranky Henchman #1 Staff Member FBBO Gold Member

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            My 70 Challenger had the 330 engine.....but it felt more like a 300 horse power engine. To me the 335 ran more like it was a 350 horse engine.

            Well, he said 'or' ........
            difference between 383 and 383 hp engine from a 69 Road Runner or 70 coronet with 383 hp and 727 tranny
             
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            • R413

              R413 Well-Known Member

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              @moparnorth

              Are you asking the internal differences? Or the physical differences you can see on the outside of the engine?

              your question is mildly confusing so please ask it again.
               
            • moparnorth

              moparnorth Well-Known Member

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            • moparnorth

              moparnorth Well-Known Member

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              I am asking the internal differences and carb for automatic tranny
               
            • Curiousyellow71

              Curiousyellow71 Well-Known Member

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              Screenshot_20211128-162544_Chrome.jpg According to the original literature the 70 383hp was only optional with a 4 speed in a coronet(unless a superbee) So a 70 coronet automatic 383 should not be stamped hp...at least if the literature is correct. In 69 a roadrunner got the 383hp...except when ordered w ac.

              The only performance difference between a 69 and 70 383 HP is a lower compression piston was used in 70. I think the 70 383 hp is suppose to have a holley carb... 69 is a carter avs.
               
              Last edited: Nov 28, 2021
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              • chtampa

                chtampa FBBO Gold Member FBBO Gold Member

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                69 RR HP engine had open chamber heads for that year and had taller pistons to keep compression up. Not much difference in height, but it was a difference.
                 
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