New to V8's. 340 or 383?

Small Block Mopar Engine

  1. dartcuda1

    dartcuda1 67 Barracuda 500ci 6sp

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    One thing if your a engine builder you can't setup a 340 and a 360 the same.They are small blocks but two different engines They can use the same parts but what are you doing with them.My 340 stock stroke got it's power from 3500 rpm and had power well over 8000 rpm and would kill any 360.Because of rpm and torque you can't build them the same.Also you are only talking about 20Ci thats not a lot between the two engines.You 360 guys need to start a 360 theed and leave the other guys alone that want to do other things.There are people that think out of the box and not in that follow the next person down the same road.I am glad he chose a 340 he will be very impressed of the power of it.One other thing you can build a stock 340 with 300HP and with all stock parts. Mark
     
  2. abodyjoe

    abodyjoe Well-Known Member

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    thinking out side the box sure as hell wouldn't include building a 340 or 360. it would be more like building a 273 or 318.
     
  3. rumblefish360

    rumblefish360 I have escaped the evil Empire State! FABO Gold Member

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    Thanks bud. I'm pretty sure he's doing a 340.

    I myself am counting the days down to when I can get into my 400 "B" engine '71 Duster. I've already had 3 small block Dusters displacing differently.
     
  4. ESP47

    ESP47 Well-Known Member

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    I definitely want to do 75 on the highway...that's pretty much needed to just keep up with traffic around here.

    Do you think 3.23's will be the best option to be able to cruise at 75 and still give me a little giddy up off the line?
     
  5. rumblefish360

    rumblefish360 I have escaped the evil Empire State! FABO Gold Member

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    Yes I do. Now, there's some math to do here. It is the tire diameter that is the last unknown couples with the gear ratio and the final drive ratio from the tranny, which is 1-1. This will give the engine RPM's at any given speed. Knowing this, you can start looking at cams that have a cruise RPM in the area.

    I think I could target a decent cam for a general arena, though I'd like to be more informed before making a choice.
     
  6. ESP47

    ESP47 Well-Known Member

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    Thanks Rumble, I'm not exactly sure what the tire size will end up being since I still have the SBP wheels on there. I'm guessing something real close to 205/70/r14? I'm not going to go with anything crazy. Either standard steelies or rallye wheels depending on what color I decide to go with.
     
  7. 1972DusterPaul

    1972DusterPaul Well-Known Member

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    For standard sized 5.5" wide wheels (steel or rally)...I would go with 215/70/14 tires. That's the largest size tire recommended for that width rim.

    That's what I have on my Duster to store the car in the Winter...they look tiny.

    I have 3.91 rear gears and the car really screams on the highway...going with 3.23 gears with stock wheels would work great.

    Paul


     
  8. Randy WM

    Randy WM Well-Known Member

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    X2. There are way more 360s out there.
     
  9. 1wild&crazyguy

    1wild&crazyguy Banned

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    I run 235 65 14's and 3.73 gears and turn around 3000 at 70
     
  10. 273

    273 Well-Known Member

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    Yes 360 would make the most sense it has the best compromises for it CID with bore/stroke and rod ratios but at the same time as you say that I shouldn't run my 273 cause its 80+ smaller I could say why would you not run a 440 cause its 80 cubes bigger. For the Hp and rpms I want 273 fits for me plus its alittle more for a challenge to build a strong running 375-400hp 273 than a 360.
     
  11. ValiantRacing

    ValiantRacing Well-Known Member

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    Now we are talking!
     
  12. Woods74

    Woods74 Broke Senior

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  13. Mo-Par

    Mo-Par Well-Known Member

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    340 would be my first choice if its no later than a 71. 72 and 73 340's had cast cranks,low compression and j heads. (like a 360)lol
     
  14. jabdusty57

    jabdusty57 Well-Known Member

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  15. charles mill

    charles mill Wildman68

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  16. AJ/FormS

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

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    Is there a question hiding somewhere? Or did you just pass out before you got to it?lol
     
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    • Wyrmrider

      Wyrmrider Well-Known Member

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      rumble got it right several pages ago
      me- stroked 340
      but wait- that's a 360
      much easier parts availability and on the street cu in rule
      cast cranks do not break and are a lot cheaper than forged

      most power per dollar starts with a magnum takeout
      look at it another way and start with heads

      or 383-400 with aluminum heads is not much heavier, heads flow a lot more, bigger valves etc
       
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      • krazykuda

        krazykuda Well-Known Member FABO Gold Member How-To Section Editor

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        This thread is older than the stains in my underwear.... deadhorse.gif
         
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        • H22A4

          H22A4 Does anyone read this?

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          A thread brought back to life after 8 years...........
           
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          • AJ/FormS

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

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            Hyup a 4" 318, is 384 cubes, and every body goes all giggly. But compared to a 360;
            the 384 is just 6.7% bigger, with a bore size that is 2.3% smaller.
            And I get branded a 318-hater,
            which is 2.3% smaller bore, and equals ~ 12% less cubes than a 360.
            Go figure.......
             
          • AJ/FormS

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

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            Yeah we know; we're just having fun until Charlie (post #90) comes around..
             
          • missing linc

            missing linc Loose nut behind the wheel

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            Anyone else wondering what the OP eventually did with his build?

            :steering:
             
          • H22A4

            H22A4 Does anyone read this?

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            It could be a while. His last post was on April 29.
             
          • AJ/FormS

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

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            Covetized?
             
          • Nat

            Nat Well-Known Member

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            i'd go 340 , i have a few and for me they beat the 360 when built to stock specs . if i were to go big block i'd go 400 with a 440 crank 400 and 383 fit better that the 440 a touch more room and can make good power Depends on what you want from the car
             
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