What Harmonic Balancer is this?

Big Block A body Tech

  1. Dragonsteel

    Dragonsteel Well-Known Member

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    Is this harmonic balancer for a externally balanced crank?

    Screen Shot 2020-05-26 at 8.21.41 PM.png
     
  2. Plymouth 65

    Plymouth 65 Floorable Deplorable

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    Yes, you can tell by the non-concentric inertia mass. 65'
     
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    • AndyF

      AndyF Well-Known Member

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      Yes, probably a 440 or 400 cast crank damper. Sometimes it will say on it. The shape varied over the years so sometimes you can narrow down the original application if you have a few to compare it to.
       
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      • Dragonsteel

        Dragonsteel Well-Known Member

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        OK, here is what's confusing, the block has casting numbers of a 71' 383, Was there ever an externally balanced 383?

        Screen Shot 2020-05-26 at 8.15.51 PM.png
         
        Last edited: May 26, 2020
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        • xLURKxDOGx

          xLURKxDOGx "An angel fat, at satan's feast" FABO Gold Member

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          Should be steel crank.

          Jake
           
        • Dragonsteel

          Dragonsteel Well-Known Member

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          Searching the forums here and found this photo in which it talks about 383-400-440 cast crank motors, which this
          motor has a cast crank.

          33740274145_e45ebf9ced_z_d-jpg.jpg crank motors
           
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          • Max1196

            Max1196 Well-Known Member

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            Yes a 1971 383 automatic could have came with a cast crank and be externally balanced. I've owned one. On another note later 400's with a standard trans came with a steel crank and be internally ballanced. Same thing, I have one!
             
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            • xLURKxDOGx

              xLURKxDOGx "An angel fat, at satan's feast" FABO Gold Member

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              Thanks, didn’t know that.

              Jake
               
            • Dragonsteel

              Dragonsteel Well-Known Member

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              Thanks Max! This was a motor out of a C-body with an automatic trans, when I had the trans rebuilt, the shop sent me a neutral balanced converter, I sent it back for a weighted converter, this was about 3 years ago. Anyway I've been having issues with the trans slipping in drive now and I'm going to have replace it soon and had wondered if this maybe could have been an issue, but it's had over 3000 miles put on it, so likely it was some other issue as it's never had any vibration issues up front.
               
            • lemondana

              lemondana BlackDart

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              The 71 383 2 bbl was the first big block to use the cast crank.
               
            • doug 371

              doug 371 Well-Known Member

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              yes I have a cast crank 383 here too...
               
            • AndyF

              AndyF Well-Known Member

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              Looks like you took some nice pictures of the engine on the stand. Did you happen to snap a picture of the crankshaft? If so you can go back and look at it to confirm if it is a cast crank or a steel crank. Seems like you have one of the first cast crank 383 engines but you might have the proof on your hard drive.
               
            • Dragonsteel

              Dragonsteel Well-Known Member

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              Andy, I went through all my photos looking just for that, but none of the trans end of the crank were taken.
               
            • PRH

              PRH Well-Known Member

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              I think he meant a pic with the pan off.

              I’ve seen some early external dampers
              have “440/400 cast crank” cast right into them.
               
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