Replacing ‘67 273 with a ‘78 318 questions

Small Block Mopar Engine

  1. Bobacuda

    Bobacuda Well-Known Member

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    2D4322A3-D12B-4637-A0F5-A5D6115BEB15.jpeg FC97D035-59CB-4083-A12A-ED36D37441B9.jpeg My ‘67 Barracuda convertible, Formula S, 273, PS, PB, automatic had its engine wiped out before I got it. The PO installed a ‘68 318 and did a lot of questionable mechanical, electrical and body work. I am in the process of rebuilding the car and undoing hooptie quality work. Which brings up all sorts of stuff I have never dealt with.

    These are the motor mounts that held the current engine, with no two bolts being the same. Are they correct for this use and do I buy new mounts for a 273 or a 318?
     
  2. MOPAROFFICIAL

    MOPAROFFICIAL Well-Known Member

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    One looks right, the one on the right.
     
  3. Bobacuda

    Bobacuda Well-Known Member

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    The one on the left was DS, the one on the right was PS. The PO drilled two extra holes in the mount, then attached the insulator to a factory hole, at an angle.

    Anyone have photos of what they should look like?
     
  4. krazykuda

    krazykuda Well-Known Member FABO Gold Member How-To Section Editor

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    Here's photos of a 67 273 engine... The bolt heads should be toward the front of the engine, then slide the mount on from the rear and install the washers and nuts... Not all of them in the pictures have the bolts installed in the proper orientation... The bolts should be 3/8 fine thread...

    Driver's side:

    DSC02271 B.JPG

    DSC02272 B.JPG

    DSC02274 B.JPG



    Passenger's side....

    DSC02275 B.JPG


    DSC02277 B.JPG
     
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    • cosgig

      cosgig MoBro Inc. FABO Gold Member

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      Does it still have the original trans, and if so do you have an annular ring for the snout of the torque converter? If not it will just Waller out the front pump of the trans but quick.
       
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      • Bobacuda

        Bobacuda Well-Known Member

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        I’ll have to remove a couple of acres of New Mexico and oil from the trans to find out what year the 904 is. I suspect it came from the junkyard with the 318. How can I tell if it needs a annular ring? BTW, what does one look like - I’ve never heard of it.
         
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        • krazykuda

          krazykuda Well-Known Member FABO Gold Member How-To Section Editor

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          Scrape off the New Mexico from the trans on the driver's side above the pan and below the linkages there should be some numbers stamped on the flat pad there... take a picture of those numbers and post them and they can be looked up to see what year the trans is....
           
        • nm9stheham

          nm9stheham Well-Known Member

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          The snout on the TC is smaller diameter for '67 and earlier, than for thr '68 and later TC snout. So if that early TC was used, then a thin ring would be installed inside the larger, later registration hole in the back of the crank to fill in the gap in the diameters.
           
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          • Bobacuda

            Bobacuda Well-Known Member

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            So, measure the inside of the hole at the end of the crank on both engines, then measure the snout of the current TC. In a perfect world, the holes should be the same and the TC snout should measure close to the hole diameters, correct?
             
          • cosgig

            cosgig MoBro Inc. FABO Gold Member

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            correct!!
             
          • Bobacuda

            Bobacuda Well-Known Member

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            Thanks for the info, folks.
             
          • 65Val

            65Val Average Length Member

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            Adapter/bushing looks like this...T-Flyte Patty use to sell them, but he's out of business now...
            dart-08-jpg.jpg

            ...and if the new engine has a cast crank, you'll need a B+M weighted flexplate to use with the old trans.
             
          • pt70

            pt70 Well-Known Member

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            Boba; There is a lot of confusion about Mopar torque converters. I'm not sure about Magnums, but all 318's and all 273's are neutral balance, cast or forged crank. --------- All 360's and cast crank 340's are externally balanced. The weighted flexplate mentioned above is for mounting a 318/273 [neutral] converter to a 360 engine.

            65Val >> '' Average Length Member'' ……………. Please do not send photos !!!!!
            Thanks for the pic of the TC bushing.
             
          • 65Val

            65Val Average Length Member

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            ???????????
             
          • nm9stheham

            nm9stheham Well-Known Member

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            FWIW..... All 318's are cast cranks (except for some of the early forged truck cranks) and all 318's are internally balanced. So no external balanced flexplate or TC for any 318.

            Good pic of the ring! Tnx.
             
          • 65Val

            65Val Average Length Member

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            Cool...I stand corrected on the 318's. I thought late 60's 318's had forged (same as 273's), and went cast in the early 70's along with the rest of the engines?
             
            Last edited: Oct 5, 2019
          • Bobacuda

            Bobacuda Well-Known Member

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            B65D15AD-B35D-4573-8976-6810715FC712.jpeg 1AE82EA2-C541-4E19-9DBE-D3620D27083F.jpeg IKrazyKuda - got to work on the mechanicals today. Took a couple of photos to get all the numbers.

            B65D15AD-B35D-4573-8976-6810715FC712.jpeg 1AE82EA2-C541-4E19-9DBE-D3620D27083F.jpeg
             
          • 65Val

            65Val Average Length Member

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          • Bobacuda

            Bobacuda Well-Known Member

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            Bolted to a ‘68 318 in a ‘67 Barracuda. Goes right along with the bodywork - rather than bolt the nosepiece to the fenders (factory), the PO welded the passenger side together. And I really wish he had bought some wires with more colors than yellow and green. So much to work through.
             
          • pt70

            pt70 Well-Known Member

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            Being average is ok. My wife never used my name and Johnny Wadd Holmes in the same sentence.
             
          • 66fyssh

            66fyssh Don't Stop Believin' FABO Gold Member

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            If you need an adapter bushing for the transmission to crank, @charliec is still selling them. I bought one from him a couple weeks ago.
             
          • Charrlie_S

            Charrlie_S Well-Known Member

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            I think you mean me. Yes I have the bushings available. Message me if you need one.
             
          • 66fyssh

            66fyssh Don't Stop Believin' FABO Gold Member

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            Oh crap, sorry. I had the wrong screen name. Glad you saw the posting so you can help others.
             
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