Crank Casting Number

Big Block A body Tech

  1. RustyRatRod

    RustyRatRod Weenie idiot loser. FABO Gold Member

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    I have a 440 steel crank. I know it's 3.75 stroke, because I measured the half stroke and it's 1.8750. Mains are 440 size. Main seal ridges fall in the direction of a clockwise rotation engine, so I know it's not marine. 6 bolt flange and drilled for manual transmission. Even though I know "what it is" I'd still like to see a casting number "somewhere". I've looked it over pretty good and haven't seen one. I guess it's possible I over looked it. Where are they usually located?
     
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    • pishta

      pishta I know I'm right....

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      Rob, I believe forged cranks are stamped with a number, not cast in. look where it could be stamped easily.
       
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      • AndyF

        AndyF Well-Known Member

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        I don't think you're going to find a number on a forged crank. The late model cast cranks had casting numbers as well as a 400 or a 440 ID but forged stuff usually doesn't have much info on them. Sometimes there will be one number or one letter stamped in them but I don't know what it means.
         
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        • fratzog lover

          fratzog lover Well-Known Member

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          Isnt the 3rd counter weight where they would stamp info about irregular journal size? That's the only numbers I know of.
           
        • RustyRatRod

          RustyRatRod Weenie idiot loser. FABO Gold Member

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          Yeah, there are a few skewed looking stamped numbers on a counter weight or two.

          Thank yall for all the responses.
           
        • oldkimmer

          oldkimmer FABO Gold Member FABO Gold Member

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          None of mine have any numbers. Post pics of the of the stamped numbers. Kim
           
        • Lefty71

          Lefty71 Well-Known Member

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          I have found that the full part number will be stamped in a line on the counter-weight on the thin outside edge of the forged cranks, usually back a ways from the front.... However, I don't see them often on the 70's cranks, usually only on the 60's ones. I've seen a few of them over the years, but not enough to say what they did when, and give a definative answer as to the rhyme or reason.
           
        • Max1196

          Max1196 Well-Known Member

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          If it's to be found, it'll be on the 3rd from the front or 3rd from the rear counter weight, more often than not- unreadable!
          100_2603.JPG 100_2593.JPG 100_2600.JPG 100_2601.JPG
           
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