A12 heads 906.

A12 Mopar Discussions

  1. pro-streeter

    pro-streeter Well-Known Member

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    I need some help understanding 906 head production. What is the letter I should be looking for on the combustion chamber side of the head for an A12?
    I heard it might be a F
    I’ve also learned that 906 heads on the B block are different than RB heads or Magnum heads.
    Additionally I would be interested in purchasing a mid year 69 set.
     
  2. Red63440

    Red63440 FBBO Gold Member FBBO Gold Member

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    :popcorn2:
     
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    • super-bee_ski

      super-bee_ski FBBO Gold Member FBBO Gold Member

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      I'm not certain..
      Must be a "DATE" Correct as the "A12" package was a 1969 1/2 year produced B-Body
      So, early 906 heads of the 69 Year would be correct.
      1970 Date Code would be incorrect.
      Henceforth, a 1968 would be incorrect.
       
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      • 33 IMP

        33 IMP FBBO Gold Member FBBO Gold Member

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        I'm almost positive the A12 cars used the exact same 906 heads as other 383/440s. So really all you need is a correct date code. Since A12s were only scheduled to be built in late March and late April, I think any February thru April 69 date would work.
         
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        • Jerry Hall

          Jerry Hall FBBO Gold Member FBBO Gold Member

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          I'm probably going to catch some flack on this, but 906 heads are just that. I don't know of any differences. Nobody is going pull the valve covers on my car to check date codes or anything else and I know of no outward differences, or internal as far as that goes. Also no difference in one's on a 383 or 440. Ofcourse if I'm wrong, please educate me.
           
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          • dadsbee

            dadsbee FBBO Gold Member FBBO Gold Member

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            Sorry, you can't have my Feb 27th heads.. LOL
             
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            • super-bee_ski

              super-bee_ski FBBO Gold Member FBBO Gold Member

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              As I mentioned and Dadsbee mentioned,
              It is a 1969 1/2 model year
              No 1968 heads
              No 1970 heads and as Dadsbee says, nothing after Feb 27th or the actual production date.
              And yeah, 906s are good heads.
              But Mopar used what they had.
               
            • super-bee_ski

              super-bee_ski FBBO Gold Member FBBO Gold Member

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              Is that the official last date of production?
              So, I imagine the 906s on A-12s are early 1969 production heads....
              And, the cars are "M" codes, 383s...so maybe they just used the production 383 heads for the A-12 Mod/Package
               
            • dadsbee

              dadsbee FBBO Gold Member FBBO Gold Member

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              I have no idea, my engine was built on Feb 27th is all.
               
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              • 33 IMP

                33 IMP FBBO Gold Member FBBO Gold Member

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                I'll try again. There were TWO scheduled production dates for A12s (not counting the 1970 Hurst Chrysler 300s, which were also A12 cars!), March 29 and April 26. Those were NOT the only days they were made.
                I would expect to see February thru April dates, but an argument could be made for January thru MAY. You might have trouble proving a may date, and you sure won't convince anyone on an early car.
                 
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                • 33 IMP

                  33 IMP FBBO Gold Member FBBO Gold Member

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                  I just got screwed by sprint getting taken over by T mobile (F#@k you T mobile). They killed the phone I owned, cause it was old, forced me to get a new "free upgrade" that's gonna cost a couple hundred bucks to lease, and managed to not transfer one single bit of data from my old phone.
                  But the funny thing is, the new phone is a galaxy A12.
                  So now I have an A12 phone, and an A12 roadrunner. Wish I was using the one as much as the other.
                   
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                  • super-bee_ski

                    super-bee_ski FBBO Gold Member FBBO Gold Member

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                    Yeah, T-mobile is rated one of the worst is service, along with throttling down your bandwidth and data speed...

                    But the A-12 B-body is rated one of the top cars, in my book...and...
                    No throttling down whatsoever!

                    please post a pic of the car?
                     
                  • 33 IMP

                    33 IMP FBBO Gold Member FBBO Gold Member

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                    I don't have any current photos, it's buried in my back garage and blocked in by a couple other old cars I can't move yet, but.... here's a shot from the staging lanes at riverside raceway, in the eighties. Still looks the same.

                    20190403_194021.jpg 20190403_194121.jpg
                    I take that back. The centerlines are on my 62 savoy now, the 15x6s are back on the runner.
                    The girlfriend was 6' (I'm 6'3") and her dad there was a navy vet, and a Hells Angel.
                     
                    Last edited: Aug 17, 2021
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                    • super-bee_ski

                      super-bee_ski FBBO Gold Member FBBO Gold Member

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                      So:
                      There you have it...
                      ydadsbvee and "us" have helped answer your question....
                      Hope this helps
                      You need to have Correct Date on the heads..
                      BUT I would take a A-12 without heads!
                      Ha Ha!

                      :thumbsup:
                       
                    • super-bee_ski

                      super-bee_ski FBBO Gold Member FBBO Gold Member

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                      So cool...
                      PS: Hoping to move from Kalifornia to Tennessee!
                      Love your car....
                      LOVE IT!!!
                       
                    • 33 IMP

                      33 IMP FBBO Gold Member FBBO Gold Member

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                      Going to the river in Arizona, eventually. Lots more room, LOTS bigger garages!
                       
                    • super-bee_ski

                      super-bee_ski FBBO Gold Member FBBO Gold Member

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                      I MAY decide to move there...Kingman I had checked out last August...35 miles from Bull Head City...
                      Are you moving to Bull Head?
                      I have a BASS Boat, we could fish!
                       
                    • 69Coronetrt

                      69Coronetrt Well-Known Member

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                      @Big D A12

                      let’s see what some actual research on this topic says…..
                       
                    • 67valiant 100

                      67valiant 100 New Member

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                      Iirc red (HP) vs blue(LP) painted valve springs would be the only difference between 906 heads with the stronger red springs coming on 335HP 383s & 375/390HP 440s.
                       
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