searching for Crank

Cars and Mopar Parts Wanted

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  1. PapstXX

    PapstXX Well-Known Member

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    Contact Seller
    Hello brother and sisters
    a new idea



    and now i am searching for a
    68 to 71 340s use a stronger forged crank

    better
    for cheap money :prayer:

    :eek:ops::coffee2::coffee2:

    Thanks for help

    shiping to 77032 TX and Pay Pal it´s the best way for me to pay :supz::usa2:



    =
     
  2. fanofpetty

    fanofpetty senior member

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    68 to 71 340s use a stronger forged crank, the 72 and 73 340s and all 360s used a cast crank. I personally won't build engine with a cast crank.
     
  3. moparlover

    moparlover Well-Known Member

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    i dont think they came out with cast cranks in 340's until 72 or so... better check into that
     
  4. Dodge33

    Dodge33 Well-Known Member

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    The cast crank 340 motor would have to be a late built 72 model year
    or 73 year. The 73 340 motor's were all cast crank motor's as far as I'm aware of. Good luck with your search.
     
  5. CudaChick1968

    CudaChick1968 Leanna ~ The Mistress of Metal FABO Vendor

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    Why a cast crank versus the stronger forged unit Uli?
     
  6. PapstXX

    PapstXX Well-Known Member

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    OK Thx brother and sisters for your information and fast answer :))))

    I have changed me question !

    Leanna sorry i have expressed myself wrong :-((((((

    We want to drill a 318 to 340 and therefore we need the 340 crankshaft
     
  7. Oldmanmopar

    Oldmanmopar Going left turning right FABO Gold Member

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    The forged cranks were in all 340 blocks with casting date of 71 and earlier. all cast cranks are in 72 casting dates.
     
  8. VDART

    VDART Well-Known Member

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    isn't the 318 crank the same as a 340-- stroke wise? so a 318 forged crank is the same as the 340? Lawrence
    Engine Years (USA)* Stroke Bore
    3.9 1988-2003 3.31 3.91
    273 1964-69 3.31 3.63
    318 (5.2) 1967-2002 3.31 3.91
    340 1968-73 3.31 4.04
    360 (5.9) 1971-2002* 3.58 4.00
    488 V-10 1991 - 2002 3.88 4.00
    505 V-10 2002 - 3.96 4.03
    * “They put the 360 in a few of the trucks in early 2003.” — Rovell Rangel
     
  9. fanofpetty

    fanofpetty senior member

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    yes a 318 forged crank is the same as a 340 forged crank and can be used in a 340 block. The eariler 318 poly motors are also forged crank motors and can be interchanged as well.
     
  10. krazykuda

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

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    But the 318's used lighter connecting rods than the 340's.

    I thought all "LA" 318's were cast cranks. You could substitute a 273 forged crank for them though. Same main bearing diameter and stroke.
     
  11. Locomotion

    Locomotion Well-Known Member

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    Whichever crank is used, it will need to be rebalanced.

    * Early 273 cranks had a small converter register so a more common, later model converter with the larger snout will not fit without machining the back of the crank.

    * Some earlier 318's had forged cranks. Forged 318 truck cranks use to be favorites because they were stronger. I believe the journals were solid, but i don't recall for sure. I have one with a worn thrust surface somewhere in my garage.

    * "We want to drill a 318 to 340 and therefore we need the 340 crankshaft"
    If this means boring out an OEM 318 to a 340 bore, then I would not recommend it. 318 cylinder walls would end up too thin for proper ring seal and overall strength.
     
  12. fanofpetty

    fanofpetty senior member

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    138s used both forged and cast cranks depending on vehicle application. trucks generally forged cranks.
     
  13. fanofpetty

    fanofpetty senior member

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    typo....above 318s
     
  14. mcode

    mcode Well-Known Member

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    If I understand you're question, You want to make a 318 into a 340 by
    boring,"drilling," it to the 340 size. Can't be done. The cylinder dia. for a 318 is 3.910, and the 340 is 4.040. You'll be into the waterjacket long before you get the 318 bored,"drilled," to the 340 size. The 273, 318, and 340 cranks will physically interchange, but they're all balanced differently
    because of the different weights of the pistons etc.
     
  15. PapstXX

    PapstXX Well-Known Member

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    Thx for your fast answer and informatiom and help


    Locomotion

    If we get into the water channels, we will draw a bushing so i hope it works
     
  16. Locomotion

    Locomotion Well-Known Member

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    Even if you don't get into the water jackets, the cylinder walls will be too thin and will actually flex and not allow a good ring seal. It will not perform to it's full potential and can eventually break. I don't know what the minimum wall thickness is, but you won't have it with a 318 block bored out that much. Sonic checking is the only way to make sure you have a "safe" cylinder wall thickness and any thicker ares should favor the "thrust" side of the cylinders..

    If you don't break into the water jackets with the overbore, you may do so with the cylinder sleeves. Some people don't have a problem sleeving a block to restore a damaged bore. But most people will agree that sleeving a block to get a bore bigger than it was designed for is not a good idea. It will reduce the over strength of the block. I believe 318 main caps are also a bit smaller and weaker than on a 340. Same size, but less metal is used.

    I'm sure Mopar blocks are very rare in Europe. But you would be better off trying to find a 360 block which might be easier to find than a 340 and has a bore closer to a 340. It has a cast crank, but the main journals are bigger and stronger than a cast 318/340 crank. A 360 can make and handle a lot of HP, as long as you don't get carried away with the HP goals and rpm's.
     
  17. swinger340

    swinger340 Well-Known Member

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    I have seen and pulled apart a 72 340 out of a stick car that had a forged crank. Surprised the hell out of me. Then again I guess someone could have been in the motor prior to me.
     
  18. lead69

    lead69 hopeless car junkie

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    Some early 72 340s had them,also the forged 318 cranks do have solid jornals like loco stated.
     
  19. Moparparts

    Moparparts Well-Known Member

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    I have an original 340 steel crank already been machine shop checked/ tagged and can ship to TX no problem PM me
     
  20. PapstXX

    PapstXX Well-Known Member

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    Well done

    so many Thanks for my Fabo brother and sisters for information and help
     
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