10" brakes on formula S cars?

Early A-Body Discussions

  1. kmoore

    kmoore Well-Known Member

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    a question for anybody with an original 65 or 66 formula S car does it have 10" brakes on it?

    Thanks for any responses. The reason I ask is I have a 65 Valiant 2nd owner have owned it since 1971 it has a hi-po 273 4-speed and has 10" brakes on it. Have always claimed its basically a formula S Valiant but have never seen another one like it.

    Any responses appreciated.
    Kevan
     
  2. doug 371

    doug 371 Well-Known Member

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    I think all the v8 cars have 10's
     
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    • toolmanmike

      toolmanmike Moderator Staff Member FABO Gold Member

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      I think (think) the S cars had 10" brakes but I don't see those listed on the Formula S components. You might want to look it up on the Hamtramck site for sure. My 66 Dart has 10" brakes and has the Rallye package but doesn't include HD brakes according to the book. I just found in the spec book on the Hamtramck site that the V8 cars had 10" brakes.
       
      Last edited: Apr 21, 2020
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      • toolmanmike

        toolmanmike Moderator Staff Member FABO Gold Member

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        Yep, I just found that in the factory spec book.
         
        Last edited: Apr 21, 2020
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        • Plymouth 65

          Plymouth 65 Floorable Deplorable

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          Formula S Valiant? That's a new one on me! 65'
           
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          • barracudadave67

            barracudadave67 Well-Known Member

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            Ive srapped out 2 66 B-Cuda Formula S cars, that had 10 in front brakes. Kelsy/Hayes disc were an option, at the time.

            Dave
             
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            • 66fs

              66fs FABO Gold Member FABO Gold Member

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              My 66, 67, and 68 383 Formula S all had 10" front drums from the factory. Not anymore...
               
            • Keith Mopar

              Keith Mopar Mopar Nut

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              I've had 2 65 Barracudas, although none were S cars. The early build 273 2bbl 4 sp car had 9" drums the later build 273 2bbl auto car had the 10" drums on it.
               
            • FISHYPETE

              FISHYPETE Well-Known Member

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              No Valiant Formula S, but could be ordered with some of the S goodies
               
            • chryslerfat

              chryslerfat Well-Known Member

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              I have the build sheet for my car. 1965 Barracuda non-S car, suspension package w/sway bar, 273 4bbl, 4 speed, power brakes, 9 inch drums.
               
            • toolmanmike

              toolmanmike Moderator Staff Member FABO Gold Member

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              Could be but all the information I saw made no mention of V8's coming with 9" brakes. Show us some factory information if it is possible. We are still discussing the possibilities. I looked at 66 because that's what I have maybe there was a change between 65 and 66.
               
            • chryslerfat

              chryslerfat Well-Known Member

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              It is on my build sheet . I am not in a position to dig the sheet out as I have moved since finding it. It would take me days to find it and I am not even going to try.
               
            • str12-340

              str12-340 FABO Gold Member FABO Gold Member

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              Remember the old saw - Never say never with Ma Mopar. Lots of stuff got ordered that wasn't on the order form, and lots of stuff ended up on cars coming off the line that weren't on the build sheet. I kept wondering why I kept coming across 1972 6 cylinder 4 door Darts and Valiants with 8 3/4 rears until I realized it was the last year for 8 3/4 A-bodies and they were dumping their stock.
               
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              • toolmanmike

                toolmanmike Moderator Staff Member FABO Gold Member

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                Lets keep digging for information. May be we can find out why, and get chryslerfat to change his red X's that he handed out.
                 
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                • chryslerfat

                  chryslerfat Well-Known Member

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                  This was discussed here years ago if you would like to search for it.
                   
                • Daves69

                  Daves69 Well-Known Member

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                  FWIW, after going to disc I gave my 9" drum set off my '69 S (383) to a member here to make some space. Sold the LCA's (with sway tabs) to another.
                  upload_2020-4-21_19-31-7.png

                  upload_2020-4-21_21-6-25.png
                   
                  Last edited: Apr 21, 2020
                • toolmanmike

                  toolmanmike Moderator Staff Member FABO Gold Member

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                  That's even more crazy. 9" drum on a 383 car? There has to be a option or reason why. Doesn't make sense.
                   
                • chryslerfat

                  chryslerfat Well-Known Member

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                  My car also came with 13 inch tires on the broadcast sheet.
                   
                • chryslerfat

                  chryslerfat Well-Known Member

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                • toolmanmike

                  toolmanmike Moderator Staff Member FABO Gold Member

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                  I found something. I bet your Barracuda was a standard built car with 9" brakes, the Performance group (273 and other goodies) and the Sport Group because you said you had 13" tires. Did you have a 3 spoke sport steering wheel?
                  Now for the brakes. In the AMA specs there's a chart of what brakes came on what car models. You would probably have to dig on your fender tag and build sheet to confirm your model and the particular brakes you have. I haven't found what the AV1 and AV2 cars are specifically, but if yours was a AV1 it came with 9" brakes standard and 10" optional. The AV2 cars came with 10" brakes standard.

                  65_Barracuda0012.jpg

                  Ama Specs - 1965 Plymouth Valiant 020.jpg
                   
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                  • toolmanmike

                    toolmanmike Moderator Staff Member FABO Gold Member

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                    Now, The AMA spec sheets are dated 7-10-1964 which is around the start of the 65 model year. Barracuda's weren't released until mid year so this information is for Valiants. You would probably have to go to the 1966 AMA specs to see if anything changed.
                     
                  • chryslerfat

                    chryslerfat Well-Known Member

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                    My car is an early 65 so that may hold true.
                     
                  • toolmanmike

                    toolmanmike Moderator Staff Member FABO Gold Member

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                    Looking at the top photo, is your car equipped as listed in the Performance and Sport groups?
                     
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                    • chryslerfat

                      chryslerfat Well-Known Member

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                      Yes The steering wheel and everything as listed.
                       
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                      • toolmanmike

                        toolmanmike Moderator Staff Member FABO Gold Member

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                        Dang, no AMA specs listed for 1966 on the Hamtramck website.
                         
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