1. HOTMOPR

    HOTMOPR Mr Horsepower

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    is there a difference between the 67 340 and later 340s? Other than the cam differences between manual and auto cars in 68. Is the 67 casting different? Better?.
     
  2. Alaskan_TA

    Alaskan_TA Well-Known Member

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    The 1968 model year was the first year for the 340.

    The '68 model year started during the 1967 calendar year though, so your block may have come in a '68.
     
  3. nm9stheham

    nm9stheham Well-Known Member

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    Late '71 and onward 340's had lower compression pistons along with changing from forged to cast crank and adding external balance weight front and rear. Timing covers and waters pumps changed on all SBM's in 1970. Some smaller variations in inside parts IIRC for the early 340's.....
     
  4. AJ/FormS

    AJ/FormS 367 FormS clone 3.09-1.92-1.40-1.09-.78od 3.55s FABO Gold Member

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    AFAIK mechanically,the 68 to 70/71 model year 340s were all same short blocks (exc the one year only manual-trans cams, as you noted), and all had 2.02intake valve heads. Covers and such changed in 70, and intakes/carbs in 71. The 2.02s were dropped to 1.88 I think 72, Compression was dropped I think in 73 and those low-C engines had different guts.
    Slow-typer again,lol.
     
  5. HOTMOPR

    HOTMOPR Mr Horsepower

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    Casing is dated late 67 for a 68 car I am sure. But supposedly the 67 castings are more desirable. Trying to find out why or is it a myth?
     
  6. AJ/FormS

    AJ/FormS 367 FormS clone 3.09-1.92-1.40-1.09-.78od 3.55s FABO Gold Member

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    More desirable for what. lol
    I got one here I'll let you have for $17,000. lol. I desire your hard earned cash. I might have a second one, but that one will be worth more on account of if you buy the first, it is suddenly worth infinitely more, as it might be the last available one on the face of the Earth..
    Ohhhhhh, chit! I just checked, and it's dated Feb-68, so sorry, lol; there go my dreams.:poke:
     
    Last edited: Feb 10, 2019 at 2:10 PM
  7. 66fs

    66fs Well-Known Member

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    Lower compression pistons happened in 72 with the 1.88 intakes. 72 could have forged or cast crank. Other than electronic ignition, the 72 and 73 340's were pretty much the same as the earlier 340's.
     
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    • HOTMOPR

      HOTMOPR Mr Horsepower

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      I've heard the main webs are thicker on the 67 castings. If you have anything of value to add I'd like to hear it. If not kindly don't respond..
       
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      • rustycowll69

        rustycowll69 Well-Known Member

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        you forgot the 70 aar and T/A blocks have filled oil pan rails, maybe more that I don't know about.
         
      • crackedback

        crackedback FABO Gold Member FABO Gold Member

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        Myth...
         
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        • HemiSSDart

          HemiSSDart Dartus Interuptus

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          I have had several June 67 340 blocks, nothing different in any 340 blocks ever...
           
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          • HOTMOPR

            HOTMOPR Mr Horsepower

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            that exactly what this block is.. 6/28/67
             
          • krazykuda

            krazykuda FABO Gold Member FABO Gold Member

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            A 340 block is a 340 block...

            It's what you put into it and on it that makes the difference....
             
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            • 6pk2goDemon

              6pk2goDemon Mopar Mod Staff Member FABO Gold Member

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              I have this info saved on the 70 340 TA blocks. Ignore the circled paragraph & read the info next to the blue arrow....

              Pic For Joel.JPG
               
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              • krazykuda

                krazykuda FABO Gold Member FABO Gold Member

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                Except for the T/A blocks...

                They had thicker main webs...

                The odds of finding one of these blocks is very slim....
                 
                Last edited: Feb 10, 2019 at 7:42 PM
              • HemiSSDart

                HemiSSDart Dartus Interuptus

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                Yes, well we are not talking about T/A blocks now are we? I have had a couple, and obviously they are different for the 4-bolt mains. I have had every year of 340 4-bbl block manufactured from 67-73 and there is no difference.
                 
              • crackedback

                crackedback FABO Gold Member FABO Gold Member

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                The OP did ask about later 340's which would include T/A 340's would it not? That's what others have addressed in regards to T/A blocks.

                Basic 340's no big deal between any of the Std 340 blocks.
                 
                Last edited: Feb 10, 2019 at 9:25 PM
              • Wyrmrider

                Wyrmrider Well-Known Member

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                or use the more widely available stroked 340 with the larger mains
                 
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                • bobscuda67

                  bobscuda67 Well-Known Member

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                  The later 340 4 barrel blocks had a thickened rib running vertically thru the center soft plug. The early blocks didn't have that.
                   
                • gtsdude

                  gtsdude Well-Known Member

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                  Is there a VIN number on the block? On the transmission rail behind the driver side head if it has one.
                   
                • MOPAROFFICIAL

                  MOPAROFFICIAL Well-Known Member

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                  Outside of the blocks. A vertical stiffening boss cast up the sides. 70 and up, both sides of block around freeze plugs.

                  '68 vs '70

                  View attachment 1715289280

                  20190214_033436.jpg

                  20190214_033520.jpg

                  They incorporate that on '70 on up sb's.
                   
                  Last edited: Feb 14, 2019 at 5:40 AM
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