-71 B body stiffening

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  1. mrluoto

    mrluoto Member

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    Good day Gents

    Installing US Car tool Level 3 chassis stiffening kitt on my -71 Satellite
    It’s my first b body project and looking forward to get it ready.

    Minitubbing, spring relocations, torque boxes and subframes already connected. Next will be Inner fender braces weldings.
    What I need to know with the
    Inner fender braces weldings?

    Question here is my old K frame. What to do with it? Any recomedations on it. I have BB 700hp under hood to street and strip
    Thank you
     
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    • Dan64

      Dan64 Well-Known Member

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      I put them on my 64' Polara, went on easy enough but you will burn the paint inside of your engine compartment, no way to avoid that one. I know most guys rebuild what came from the factory with a good measure of success but have you looked at Reily motor sports "AlterKation" front end set up. It will handle like its on rails and you loose around 120lb. off the front .
       
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      • davek

        davek FBBO Gold Member FBBO Gold Member

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        would love to see some pics of your car.
         
      • bearman

        bearman FBBO Gold Member FBBO Gold Member

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        you can always rebuild and do like others have done cut out a section of the k frame it makes the front end lighter and saves on cost. they also have stiffen plates for the lower control arms look at pst they are a sponsor and have some great pricing. but you build it your way is always the best way.
         
      • mrluoto

        mrluoto Member

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        Good day Gents
        Thank you for your comments. Added underneath pics.
        Need to check out what fits my engine bay layout best.
        Elephant ears is one option as well. I assume it will stiff well front subframe.
        Thank you

        9D2C3A04-6C9B-4B68-A877-5AE85B8A541E.jpeg 819F8CC5-CDDD-4B2F-BB47-1DFB92D4BC54.jpeg E16E38B2-6277-4397-99FC-FE02DF1812FF.jpeg
         
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        • mrluoto

          mrluoto Member

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          Picks added
           
        • mrluoto

          mrluoto Member

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          • dvw

            dvw Well-Known Member

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            Two different directions here. Drag racing you can trim the K and other stuff and lose quite a bit of weight. My all steel except hood 64 Belvedere drag car weighs just under 3100lb with lightened stock stuff.. Handing and corner carving you want to add stiffness. Boxed arms, reinforced steering box mount, core support. I just did a QA1 complete front end for a customer. To be honest I'd keep the stock stuff. No way its 120lbs lighter than a factory manual box setup.
            Doug
             
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            • 71Beeper

              71Beeper Well-Known Member

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              Mrluoto - I put the US cartool inner fender braces on my 71 Clonerunner along with the rad support brace.
              Dec 11 (9).jpg Dec 30 (14).jpg
              US cartool at the time only offered the inner braces for E-bodies & not B-bodies.
              I phoned them and asked if the E-body ones would work on a B-body and they wouldn't give me a straight answer.
              So I ordered them anyway.
              Long story short is they will need some massaging but its not a difficult task.
              My car also has front and rear torque boxes and the frame connectors too.
              Dec 9 (10).jpg
              But it is a street car.
               
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              • biomedtechguy

                biomedtechguy Accelerati Rapidus Maximus FBBO Gold Member

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                Your posts are so informative, but in my case I changed out the entire front suspension including the K-member with QA1 components. I'm not looking to carve corners, I definitely want to get on the quarter mile, but still mostly used on the street.
                I'm trying to be relevant in this post for the OP. My Upper Control Arms (UCAs) are the only non-QA1 item as SPC UCAs have far more adjustability.
                With all of the strengthening, stiffening (including USCT frame connectors, torque boxes) and systems I had installed, Calvert split mono leaf springs and Assassin traction bars, and so on, I believe the QA1 complete swap over along with their K-member just adds to the overall goals I have and it sure looks nice too!
                 
              • polyjohn

                polyjohn Well-Known Member

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                Wonderful build Mrluoto,
                I am a fellow 71 Plymouth owner in the UK.
                I was going to go the same route as you with all the body mods, but as she is a numbers matching GTX I kept her fairly original.
                Just some home made frame connectors and lots of rust replacement lol...
                 
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                • polyjohn

                  polyjohn Well-Known Member

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                  Nice work beeper!
                  I have a 71 GTX myself.
                  Those look like factory GTX strengthening plates and torque boxes?
                  Have you fitted them yourself or did your car come with them?

                  Obviously its a lengthened E-body floorpan for the 71 B-body...(hope thats right)?

                  71 floorpan.jpg

                  The 512ci engine in the 'avatar' picture is the one I will use for drag racing, (spare).
                  I was very lucky, as my 440ci hipo engine and trans are factory originals too.
                   
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                  • 71Beeper

                    71Beeper Well-Known Member

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                    Thanks polyjohn.
                    Yes, I fitted the front and rear torque boxes.
                    I got them from here.
                    upload_2022-3-7_5-59-9.png

                    I do believe that the front floor pans are the same as E-body, not sure about the rear pans.
                    I did install an E-body drivers side floor pan when I was putting in the 4 speed hump.
                     
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