383 crank shaft journal size ?

Big Block A body Tech

  1. RAT ROD AL

    RAT ROD AL I know just enough to be dangerous FABO Gold Member

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    Can anyone post the journal size for a 383 crank. I have this one looks nice and clean . I only have a digital caliper to check this, but it only reads 2 decimal points.

    Just wondering if this is standard or has been turned some. 20210721_161526.jpg 20210721_161533.jpg

    Here is what I get with my" cheap 0" calipers.
    20210721_163923.jpg

    Thanks for any help
     
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    • Max1196

      Max1196 Well-Known Member

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      Rod journal size , 2.3740" - 2.3750"
      Main journal size, 2.6245" - 2.6255"
      These are for a "standard" size.
       
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      • 4spdragtop

        4spdragtop CONGRATS NORTH AMERICA! FABO Gold Member

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      • 33IMP

        33IMP Well-Known Member

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        Harbor freight has a digital caliper that reads three digits, for about ten bucks. (Or, at least they did have, before the 20% coupons went away.)
        You are trying to measure something where a thou or two is critical, with a tool that only reads to a hundredth?
         
      • RAT ROD AL

        RAT ROD AL I know just enough to be dangerous FABO Gold Member

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        So no way to determine if this is std or .010, .020 under ? I need a Mic.
         
      • 4spdragtop

        4spdragtop CONGRATS NORTH AMERICA! FABO Gold Member

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        If you give me a good clear pic, I'll se what my digital calipers read??:poke:
         
      • RAT ROD AL

        RAT ROD AL I know just enough to be dangerous FABO Gold Member

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        Well ya, LOL. that's all I have to work with. :BangHead:

        I was just trying to check it. Guess I need better tools !
         
      • 33IMP

        33IMP Well-Known Member

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        Well, if it were .010 under, your measurements to the hundredth would be 2.36(x?) and 2.61 (x?).
         
      • RAT ROD AL

        RAT ROD AL I know just enough to be dangerous FABO Gold Member

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        I have a yard stick !
        :rofl:
         
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        • 4spdragtop

          4spdragtop CONGRATS NORTH AMERICA! FABO Gold Member

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          Lmfao
           
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          • 4spdragtop

            4spdragtop CONGRATS NORTH AMERICA! FABO Gold Member

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            Measure once cut twice!!
             
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            • 33IMP

              33IMP Well-Known Member

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              A set of mics would be ideal, but a good dial caliper is one of the most valuable tools you can get. Measures inside, outside, and depth. Digital, with three or four digit resolution can do it too, but i prefer my analog dial. (I do have a digital, but i find the battery dead quite often when i try to use it.)
               
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              • RAT ROD AL

                RAT ROD AL I know just enough to be dangerous FABO Gold Member

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                I used to have a nice set of Mics but didn't use them for years, eyes have gone south , even with glasses and couldn't read them anymore. Guess I make a trip to HF. SO you think this crank could be STD ?
                 
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                • 33IMP

                  33IMP Well-Known Member

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                  I do.
                  Edit: my eyes are crap too (eight surgical procedures), but i had my eye surgeon put in nearsighted lenses when i had my cataracts done. My close-up vision isnt bad, but when i REALLY need to see something...... i use a set of cheap plastic eye loops from (wait for it) harbor freight. Set of five was two bucks? Less than five, for sure.
                   
                  Last edited: Jul 21, 2021
                • Bewy

                  Bewy Well-Known Member

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                  I wouldn't trust verniers, even if they measure to three decimal points for measuring cam, rod, main brgs; or pistons/bores. When I have compared measurements taken with digital verniers/calipers & then with a micrometer, the numbers are different.
                   
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