socket size for a small block mopar crank shaft bolt?

Small Block Mopar Engine

  1. jeff schwarz

    jeff schwarz Active Member

    Messages:
    39
    Likes Received:
    3
    Joined:
    Dec 19, 2018
    Location:
    555 freeman rd. #18 central point oregon 97501
    Local Time:
    8:49 PM
    Hi, Can someone tell me the socket size for a small block mopar crank shaft bolt?.
    Thank you, Jeff.
     
  2. sireland67

    sireland67 Well-Known Member

    Messages:
    8,246
    Likes Received:
    2303
    Joined:
    Oct 27, 2010
    Location:
    WV
    Local Time:
    11:49 PM
    1.25”
     
    • Agree Agree x 2
    • jeff schwarz

      jeff schwarz Active Member

      Messages:
      39
      Likes Received:
      3
      Joined:
      Dec 19, 2018
      Location:
      555 freeman rd. #18 central point oregon 97501
      Local Time:
      8:49 PM
      Thank you.
       
    • 416stroker

      416stroker Well-Known Member

      Messages:
      779
      Likes Received:
      16
      Joined:
      May 14, 2006
      Location:
      Kalamazoo, Mi
      Local Time:
      10:49 PM
      1 1/8 inch on my 340
       
    • 65 Dartman

      65 Dartman FABO Gold Member FABO Gold Member

      Messages:
      10,196
      Likes Received:
      2024
      Joined:
      Sep 24, 2006
      Location:
      Strasburg, VA
      Local Time:
      11:49 PM
      Everyone I have is inch and a quarter
       
    • brian6pac

      brian6pac Well-Known Member

      Messages:
      3,865
      Likes Received:
      2377
      Joined:
      Nov 15, 2016
      Location:
      N.E.Ohio
      Local Time:
      11:49 PM
      1 1/4"
       
    • Johnny Mac

      Johnny Mac www.blueprintengines.com FABO Vendor

      Messages:
      2,765
      Likes Received:
      1435
      Joined:
      Jul 10, 2010
      Location:
      OHIO
      Local Time:
      11:49 PM
      ARP 12 point is 1 1/16
      just in case someone pulls this up in the future looking for this one.
       
      • Like Like x 1
      • 416stroker

        416stroker Well-Known Member

        Messages:
        779
        Likes Received:
        16
        Joined:
        May 14, 2006
        Location:
        Kalamazoo, Mi
        Local Time:
        10:49 PM
        Obviously there are some differences. Mine is 1 1/8
         
      • MOPAROFFICIAL

        MOPAROFFICIAL Well-Known Member

        Messages:
        3,647
        Likes Received:
        2636
        Joined:
        Jun 1, 2016
        Location:
        breakwater
        Local Time:
        8:49 PM
        Depends on what brand tools you have hahaha ;-) let's just say the one that fits a standard Factory crank bolt, fits it loose for some.
         
        • Like Like x 1
        • 72bluNblu

          72bluNblu FABO Gold Member FABO Gold Member

          Messages:
          9,561
          Likes Received:
          3716
          Joined:
          Nov 28, 2008
          Location:
          NorCal
          Local Time:
          8:49 PM
          1-1/4" and 1-1/8" are the most common.

          Like most things about these cars it depends on the year of manufacture, and of course whether or not it's been changed at some point in the last ~50 years.
           
        • Alaskan_TA

          Alaskan_TA Well-Known Member

          Messages:
          4,694
          Likes Received:
          2604
          Joined:
          Nov 12, 2004
          Location:
          PA
          Local Time:
          11:49 PM
          I have originals here in both sizes also.
           
        • Krooser

          Krooser Reform School Graduate

          Messages:
          1,389
          Likes Received:
          1050
          Joined:
          Jul 19, 2015
          Location:
          Land of Cheese
          Local Time:
          10:49 PM
          I had to revise a bolt head last week when a SBC intake bolt was rusted between a 9/16 and 1/2". Some input from my heat wrench made it a 14mm and I pounded on the correct socket!
           
        • sireland67

          sireland67 Well-Known Member

          Messages:
          8,246
          Likes Received:
          2303
          Joined:
          Oct 27, 2010
          Location:
          WV
          Local Time:
          11:49 PM
          At least you did not have a round head bolt on a 318 LA, it was not machined for the hex.
           
        • MOPAROFFICIAL

          MOPAROFFICIAL Well-Known Member

          Messages:
          3,647
          Likes Received:
          2636
          Joined:
          Jun 1, 2016
          Location:
          breakwater
          Local Time:
          8:49 PM
          It was torqued on how?
           
          Last edited: Aug 12, 2019
        • oldkimmer

          oldkimmer FABO Gold Member FABO Gold Member

          Messages:
          11,404
          Likes Received:
          1821
          Joined:
          Nov 11, 2006
          Location:
          Kindersley, Saskatchewan,
          Local Time:
          10:49 PM
          Any small block LA or big block I have ever had from the mid 60s to the early 90s have all been 1 1/4 inch. Kim
           
          • Agree Agree x 2
          • sireland67

            sireland67 Well-Known Member

            Messages:
            8,246
            Likes Received:
            2303
            Joined:
            Oct 27, 2010
            Location:
            WV
            Local Time:
            11:49 PM
            I dont know, but the sob was tight, an air chiesel would not spin it out, I cut it off with a cut-off wheel, sacrificed the head.
            It was tight, let the machine shop deal with the remains.
            It still had the factory shim gaskets on the heads and intake, so most likely somebody had a bad day on the assembly line, he/she put it in the back farthest bolt on the passenger side, so it would be impossible to remove.
            It still has the hardens hashes on it.
            Fun, Fun

            AJzaw3.jpg
             
            • Like Like x 2
            • oldkimmer

              oldkimmer FABO Gold Member FABO Gold Member

              Messages:
              11,404
              Likes Received:
              1821
              Joined:
              Nov 11, 2006
              Location:
              Kindersley, Saskatchewan,
              Local Time:
              10:49 PM
              Dam, I have never seen that b4. Kim
               
            • sireland67

              sireland67 Well-Known Member

              Messages:
              8,246
              Likes Received:
              2303
              Joined:
              Oct 27, 2010
              Location:
              WV
              Local Time:
              11:49 PM
              Neither have I, and I have been fooling with small block mopars for over 35 years.
              The engine came out of a 73 Charger, the guy said it ran and the trans would still pull the car around, but rust had gotten to the charger, he still had the car, in my opinion it was fixable he just parted it out, because he had several nice of the same era Chargers.
              The engine, did end up being a nice builder, just needed cylinders honed.

              WRMBh8.jpg
               
              • Like Like x 1
              • oldkimmer

                oldkimmer FABO Gold Member FABO Gold Member

                Messages:
                11,404
                Likes Received:
                1821
                Joined:
                Nov 11, 2006
                Location:
                Kindersley, Saskatchewan,
                Local Time:
                10:49 PM
                That’s sweet. Kim
                 
              • sireland67

                sireland67 Well-Known Member

                Messages:
                8,246
                Likes Received:
                2303
                Joined:
                Oct 27, 2010
                Location:
                WV
                Local Time:
                11:49 PM
                Thanks, its going in a old cuda drag car I have, back 1/2 dana 60 with a cage, just need to get the car together, most likley this winter, the back 1/2 and cage are done, just need to hang the sheet metal.
                 
              • brian6pac

                brian6pac Well-Known Member

                Messages:
                3,865
                Likes Received:
                2377
                Joined:
                Nov 15, 2016
                Location:
                N.E.Ohio
                Local Time:
                11:49 PM
              • brian6pac

                brian6pac Well-Known Member

                Messages:
                3,865
                Likes Received:
                2377
                Joined:
                Nov 15, 2016
                Location:
                N.E.Ohio
                Local Time:
                11:49 PM
                If some one doesn't want you to take it apart, maybe will void the warranty ? Or they don't want you to know whats inside.
                 
              • sireland67

                sireland67 Well-Known Member

                Messages:
                8,246
                Likes Received:
                2303
                Joined:
                Oct 27, 2010
                Location:
                WV
                Local Time:
                11:49 PM
              • MOPAROFFICIAL

                MOPAROFFICIAL Well-Known Member

                Messages:
                3,647
                Likes Received:
                2636
                Joined:
                Jun 1, 2016
                Location:
                breakwater
                Local Time:
                8:49 PM
                Maybe a cutoff wheel making a slot and then a hammer and impact driver 'might have got it out. Another way might have been to punch and drill the top off in increments.
                 
              • 69_340_GTS

                69_340_GTS Well-Known Member

                Messages:
                3,376
                Likes Received:
                1296
                Joined:
                Jul 11, 2014
                Location:
                Torrington, CT
                Local Time:
                11:49 PM
                I bet it looked like a standard hex head bolt, but it was somehow not correctly machined. The hex part spun off when a certain torque was reached. Much like those "Tork Bolts", but unintentional.
                 
              1. This site uses cookies to help personalize content, tailor your experience and to keep you logged in if you register.
                By continuing to use this site, you are consenting to our use of cookies.