Finned vs Non Finned Brake Drums

General Mopar Tech Discussions

  1. adk-roadrunner

    adk-roadrunner Well-Known Member

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    Hey guys I'm in the process of getting my 8 3/4 rear ready to go into my 73 Roadrunner. I'm rebuilding the 10" rear drum brakes and the drums it came with were shot. I ordered drum's through advance auto and when they arrived they were finned with a larger outside diameter and the originals had no fins. I'm assuming there shouldn't be any issues as I'm using 17" wheels and there should be plenty of room. does anyone know of any other issue's other than the added weight.

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    Last edited: Jul 22, 2021 at 9:04 AM
  2. 33 IMP

    33 IMP Well-Known Member

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    Other than the chances are 100% that they are chinese..... i would normally prefer the fins. They are intended as a heat sink. Theory is that they wont overheat under severe conditions.
     
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    • Cranky

      Cranky Banned Staff Member FBBO Gold Member

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      You can overheat finned drums too...... but it takes a little longer
       
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      • adk-roadrunner

        adk-roadrunner Well-Known Member

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        My concern level over whether brake drums are Chinese is at about a zero if they work.
         
      • 66Satellite47

        66Satellite47 FBBO Gold Member FBBO Gold Member

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        I've both versions from the factory. Not sure there's any difference. Might be concerned about Chinese parts though.
         
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        • adk-roadrunner

          adk-roadrunner Well-Known Member

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          They are carquest wearever drums where ever those are made. They are atleat twice as heavy.
           
        • adk-roadrunner

          adk-roadrunner Well-Known Member

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          I just read a write up on a car talk web page and they are stating there are no longer any companies making brake drums and roots in the USA. It states that even the big domestic brake brands we know of are buying Chinese blanks now. I wouldn't really be surprised.
           
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          • 33 IMP

            33 IMP Well-Known Member

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            But see, that is the question, will they work? We are wondering if they are round, or will they need to be turned. And who does that anymore?
             
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            • adk-roadrunner

              adk-roadrunner Well-Known Member

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              Thats true If I knew someone with a brake lathe I'd definitely try to clean up my originals. If I was still in high-school I could bring them in and cut them. Lol that machine has probably been gone a long time.
               
            • 33 IMP

              33 IMP Well-Known Member

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              Agree. There are a few, very few, new cars that still have drums on the back, (at least there were, a few years ago).
              Im betting they arent getting serviced anymore either. Im sure if they need work, they just get replaced.
              When i scored a rear disc a while back, i didnt even bother trying to find someone who could turn it, just bought two new discs...... for about five times what it should have cost to turn them.
               
            • 69Bee

              69Bee FBBO Gold Member FBBO Gold Member

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              Yea, brake drums, brake drums... What I would like to see is pics of the 17 foot wheels on your car!!!

              :xscuseless:
               
            • adk-roadrunner

              adk-roadrunner Well-Known Member

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              Lol that's why you should never post when half asleep at the end of the night.
               
            • 440 Charger

              440 Charger FBBO Gold Member FBBO Gold Member

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              Hopefully some day will learn.
               
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