LA head casting ID help.

Discussion in 'Small Block Mopar Engine' started by Arron tate, Nov 30, 2018.

  1. Arron tate

    Arron tate H V C S

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    Hello All,
    Looking for some help with casting numbers on a set of heads.
    Any info on the heads in the attached pictures would help me identify them.
    Year, engine size ?
    Happy Mopar :)
    Thanks in advance,
    Arron
    Head 1.jpg
    Head 2.jpg
    Head 3 A .jpg
    Head 4 A.jpg
     
    Last edited: Nov 30, 2018
  2. dodge71demon

    dodge71demon Well-Known Member

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  3. perfacar

    perfacar Well-Known Member

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    360 915 casting number, they can have 1.88 or 2.02 valves , depends 1970 to 1972, 340 and 360.
     
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    • brian6pac

      brian6pac Well-Known Member

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      0312 is the date = 31st day of 1972, 915 casting would be 1.88 intake valve and 1.60 exhaust. Could be on a 340 or a 360, wont be 2.02 in 1972
       
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      • Arron tate

        Arron tate H V C S

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        Thanks all
        Do you know what the "B" in the casting number for?
        Could this head have come on a 1973 340 car although it was cast in 1972?
        Also the "J" by both the inner spark plugs, Does this denote its a "J" head?
        Does the "360" on the head stand for anything?
        happy Mopar :)
        Thanks in advance
        Arron
         
        Last edited: Nov 30, 2018
      • rigger3006

        rigger3006 Well-Known Member

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        yes on the j head
         
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        • Arron tate

          Arron tate H V C S

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          Thanks to all.
          Does anyone know what the "B" in the casting number for?
          Could this head have come on a 1973 340 car although it was cast in 1972?
          Does the "360" on the head stand for a 360 head?
          In looking at various post's would this be a 360 head as opposed to a 340 head?
          "3418915 – 1970-1972, 360 LA-series small-block, 1.88/1.60 valves, 65cc-73cc"
          "3418915 – 1971-1972, 340 LA-series small-block, 1.88/1.60 valves"
          Would a 340 head say 340?
          Happy Mopar :)
          Arron
           
        • perfacar

          perfacar Well-Known Member

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          this head was used on 1971 340 with 2.02 int valve. on 360 had a 1.88 valve. it has 360 cast on it only no 340. like I said, depends on which year engine , determines int valve size.
           
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          • krazykuda

            krazykuda FABO Gold Member FABO Gold Member

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            The "B" in the casting number most likely is the change level of that casting...

            The change level is used to track what print revision that those castings were made to...

            As parts evolve and are updated due to making improvements or making changes for future models, they make a revision to the part print which is the blueprint drawing for that part... Every change to the blue print is tracked in a chart on that print so you have traceability for each change and what was changed/modified... That change is then referred to as the revision level... When they change the tools/molds to make the new revision, they are required to make the change in the casting so they can track it to what revision of the part print that it was made to....

            All castings are required to have the casting number and mold number identified on the part for traceability if any quality issues come up, they can then track it to a particular mold if only one mold has the defect... If they couldn't track what mold has the problem, then they have to go through every mold to look for the issue that may be on only one... There would be alot of time wasted looking for the needle in the hay stack...

            There are two prints for the heads, the cast print and the machined print...

            The head casting print is what the foundry has to meet with the molds for the raw castings... Any changes to the raw casting are defined by a new revision on the head casting print... When the new changes for that print are put into each mold, the molded casting number has to have the new revision letter with it so they can track it to that change level of the print if any issues come up... The foundry needs to be able to tell which castings are the new ones vs which ones are the old ones as they make the change so they can make sure that they get rid of all of the old revision level before they start shipping the new revision level so an old one doesn't show up 6 months from now... If they find an old head casting sitting around, they have to scrap it after the full change has hit production...

            Then there is the head machining print which defines all of the machining required to make the head functional... All machine operations are defined with tolerances so they can machine the critical features that can't be controlled in the raw castings...

            Any changes to the machined features are defined and tracked on the head machining print... Like if they change a bolt size, they will define a new drill size and thread tap for the thread on the head machining print... Same with valve seats, milled surfaces, etc....

            A change to the machining does not affect the head casting print.. So they have to track each change to what print controls that feature on the part...
             
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            • Jadaharabi

              Jadaharabi FABO Gold Member FABO Gold Member

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              IMG_0340.JPG

              For your viewing pleasure.
               
            • Arron tate

              Arron tate H V C S

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              Thanks Jadaharabi
              So if i am reading this correctly i have 360 heads not 340 heads judging by your photo and
              If the following is correct then 340 heads would be stamped 340 and on a 340 and 360 heads would be stamped 360 and be on a 360?
              "3418915 – 1970-1972, 360 LA-series small-block, 1.88/1.60 valves, 65cc-73cc"
              "3418915 – 1971-1972, 340 LA-series small-block, 1.88/1.60 valves"
              Now being I am new to this head ID thing my next question would be does it matter if I have 360 heads on a 340?
              Its more or less stock.
              happy Mopar :)
              Thanks in advance,
              Arron
               
            • Jadaharabi

              Jadaharabi FABO Gold Member FABO Gold Member

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              The heads with 360 on them have the 1.88 intake. They are the same as the 340 except for the size of the intake valve.
              Yes you can bolt them on a 340. What piston are you using?
               
            • Arron tate

              Arron tate H V C S

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              I just pulled the engine out and have not started disassembly this is why i am questions so I can start lining up parts if needed.
              The block has the 340 casting number on it but the heads say 360 so i am assuming that someone may have been at this before me.
              the intake is correct for a 340 and are the exhaust manifolds.
              I will know more when i get it apart and will update you.
              Happy Mopar :)
              Thanks in advance
              Arron
               
            • Jadaharabi

              Jadaharabi FABO Gold Member FABO Gold Member

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              If it is a 72 or 73 engine I would say that those are probably the original heads.
               
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              • Arron tate

                Arron tate H V C S

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                Hello jadaharabi,
                Date code on block is also 72 But its in a 73 H code duster Not numbers matching so i am guessing that the OEM motor was pulled and this is the replacement. The Intake is date code 73.
                Happy Mopar :)
                Thanks in advance
                Arron
                 
              • Jadaharabi

                Jadaharabi FABO Gold Member FABO Gold Member

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                I believe if dated after 1 July 1972 it would be a 73 model year engine.
                 
              • Arron tate

                Arron tate H V C S

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                Hello jadaharabi,
                Head date code = 0312
                I don't have the date code of the block with me but the casting number is 2780930-340-3 with a big 4 next to it.
                Happy Mopar :)
                Thanks in advance
                Arron


                head-1-jpg.jpg
                 
              • Jadaharabi

                Jadaharabi FABO Gold Member FABO Gold Member

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                .
                Post #4 tells the story on the heads.
                The date on the head is not going to match the date on the Block.
                The date of the casting of the block will be on the opposite side that they had the part number for the block. Should be on the right side.
                 
              • Jadaharabi

                Jadaharabi FABO Gold Member FABO Gold Member

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                Did you check the numbers on the driver side front of the block and on the passenger side rail just above the oil pan for numbers matching.

                May the Mopar be with you.
                 
                Last edited: Dec 7, 2018 at 8:27 AM
              • Arron tate

                Arron tate H V C S

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                Hello jadaharabi,
                Yes I did confirm the numbers and sadly they do not match the VIN number :(
                Happy Mopar :)
                Thanks in advance
                Arron