CAST CRANK or STEEL CRANK?

Small Block Mopar Engine

  1. greyghost340

    greyghost340 GreyGhost 340

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    Cast or Steel Crank? Very little markings on this crank, need feedback. :BangHead:

    IMG_4334 (1).JPG

    IMG_4340 (1).JPG

    IMG_4343 (1).JPG

    IMG_4344 (1).JPG

    IMG_4346 (1).JPG
     
  2. 340demon72

    340demon72 FABO Gold Member FABO Gold Member

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    Steel. Can tell by the wide parting line and the rounded corners on the counterweights.
     
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    • yellow rose

      yellow rose Overnight Sensation FABO Gold Member

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      In your first picture you can see the width of the parting line just below the main bearing.

      That's a forged steel crank. If it was cast, that parting line would be very thin.
       
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      • greyghost340

        greyghost340 GreyGhost 340

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        Thank you for the feedback, very much appreciated.
         
      • MoparMike1974

        MoparMike1974 Well-Known Member

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        I find it easier to look at the counter weights instead of the parting line. I can tell at a glance by looking at the weights.
         
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        • famous bob

          famous bob mopar misfit

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          When in doubt , stand it on its end and tap the counter weight w/ a small ball peen , cast=thud , forged =ping----------
           
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          • greyghost340

            greyghost340 GreyGhost 340

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            Thanks
             
          • Wyrmrider

            Wyrmrider FABO Gold Member FABO Gold Member

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            and cracked crank goes...
             
          • MOPAROFFICIAL

            MOPAROFFICIAL FABO Gold Member FABO Gold Member

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            Steel, #457 crank for a 340.
             
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            • 66fs

              66fs FABO Gold Member FABO Gold Member

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              Shot peened also.
               
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              • Dartnut

                Dartnut Don't hate me because i'm beautiful

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                Bang Bang Bang Crrrrrunch...........
                At 6,000 rpm.
                 
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                • pishta

                  pishta I know I'm right....

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                  cast cranks have sharp counterweight corners. Forged are all rounded

                  crankshaftid.jpg
                   
                • pishta

                  pishta I know I'm right....

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                  newer aftermarket forged are cleaner looking than old OEM ones, can tell by full fillet bearings too. Cast usually have back cut bearing surface corners too.
                  esp-444037506760_w_xl.jpg
                   
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                  • greyghost340

                    greyghost340 GreyGhost 340

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                    Clear and simple. Great feedback & photos. Thanks
                     
                  • Jadaharabi

                    Jadaharabi FABO Gold Member FABO Gold Member

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                    "Thud" weather it is cast or forged.
                     
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                    • Jadaharabi

                      Jadaharabi FABO Gold Member FABO Gold Member

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                      What is this crank to? 8 bolt flywheel and no grinding on the sides of the throws.
                       
                    • pishta

                      pishta I know I'm right....

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                      Stock forged crank pic, Eagle 4340 steel 8-bolt 440 ESP forged.
                       
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