strange block markings

Slant 6 Engines

  1. briwill70

    briwill70 Well-Known Member

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    Inspecting and cleaning up what I was told was a 51k mile engine out of a 73 Dart. Everything looks to be original (water pump, hoses, head gasket) but found these weird markings on the block. Suspect it may be from a salvage yard. Doubt it is factory. Thoughts?

    block markings.jpg
     
  2. Dana67Dart

    Dana67Dart Like a fine wine, only getting better with age! FABO Gold Member

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    Someone posted something like this in the last 3 years
     
  3. Syleng1

    Syleng1 Karma is real and Life is short... FABO Gold Member

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    Those are the letters of "The Devil." Evil Block "Hail Mary full of grace...."
     
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    • killerslant

      killerslant FABO Gold Member FABO Gold Member

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      If you are talking about the paint brushed B C E ,that is the factory bore size markings. They measured to the hundred of a thousandth and mated pistons the same way. They were bored and honed at one place and finished assembled at another station.
       
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      • killerslant

        killerslant FABO Gold Member FABO Gold Member

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        Nos 440 short block

        20200617_200859.jpg
         
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        • pishta

          pishta I know I'm right....

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          Suprised they left the factory like that. "Hey salesman, who tagged my motor in my brand new car?"
           
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          • Alaskan_TA

            Alaskan_TA Well-Known Member

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            The markings were applied before assembly, the engine paint was applied after engine assembly so the paint did not always adhere to the letters well.
             
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            • briwill70

              briwill70 Well-Known Member

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              Good to know. Thanks for the info.
               
            • brian6pac

              brian6pac Well-Known Member

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              It is for the piston size, they measured the finished bore then put a,b,c, for the matching pistons
               
            • beanhead

              beanhead Well-Known Member

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              They're stubborn too, here's a 440 of mine after returning from the machine shop--tanking and blasting didn't even completely remove all traces on this one(gotta zoom in to see them)
              beans440.jpg
               
              Last edited: Jul 3, 2020
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              • 67Dart273

                67Dart273 FABO Gold Member FABO Gold Member

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                I'll be damned. Here I am 72 and never knew this!!
                 
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                • Demonic

                  Demonic Well-Known Member

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                  Yes, it's one of the things that is proof Chrysler was a company of engineers and machinists.

                  >>> If you have the 69 FSM, the letter specs are published in the 426 bore size section of engines. This is one of the reasons why our engines lasted so long - pistons fitted to the .0003 spec.

                  I would love to see the factory data for all the other motors - happy to see it on the Slant block above in the first post. When I removed my untouched 383 4 bbl from my Charger, the letters were there. I was amazed they took the time for a 383. Makes sense for the Hemi's. Now proof for a slant. Amazing.
                   
                • slantsixdan

                  slantsixdan =..=

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                  Also present under the paint on several aluminum 225 blocks I've handled over the years.
                   
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                  • pishta

                    pishta I know I'm right....

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                    makes sense the slant letters are as cast and the paint is missing....the letter paint seems to have worn off the block and took the blue paint on top with it.
                     
                  • MOPAROFFICIAL

                    MOPAROFFICIAL FABO Gold Member FABO Gold Member

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                    This is true .

                    First time I ever seen the letter markings was on the AL 225.
                     
                  • Princess Valiant

                    Princess Valiant Duster specialist

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                    I have a very original cast iron 1972 slant six out of a dodge demon with the letter markings

                    BDDCDC

                    20200723_204239.jpg

                    20200723_204246.jpg
                     
                  • famous bob

                    famous bob mopar misfit

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                    HEMI`s didnt come with .003 clearance tho-----lol
                     
                  • Demonic

                    Demonic Well-Known Member

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                    Look at the decimal point again in my post and how many places to the right....
                     
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