Engine Pad BB Anomaly? Not Rectangular? - NCRS Discussion Boards

Engine Pad BB Anomaly? Not Rectangular?

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  • Steven S.
    Frequent User
    • June 27, 2013
    • 86

    Engine Pad BB Anomaly? Not Rectangular?

    Hi members. I am thinking about buying another 70 LS5 454, and found one that I like. My problem is with the Engine pad, since I have not seen a BB engine pad that was not perfectly rectangular. I have owned two very original 454 cars this year, and both had perfectly rectangular pads.

    I have attached a photo and would appreciate any opinions on this pad. I am not 100% sure on the stamping, but the VIN area looked perfect to me, although I'm not sure about the two number 1s in the Date, as mine have all had the 1 looking like the capital letter I.

    Could this be a block from a truck, and not a passenger car? Could it be a casting anomaly?

    I have also attached a photo of the 72 LS5 that I owned, which was owned by an older woman for 40 years, which I believe is definitely the original block.

    Your opinions are appreciated.

    Thank you,

    Steve
    Attached Files
  • Joe L.
    Beyond Control Poster
    • February 1, 1988
    • 43193

    #2
    Re: Engine Pad BB Anomaly? Not Rectangular?

    Originally posted by Steven Sperrazza (12077)
    Hi members. I am thinking about buying another 70 LS5 454, and found one that I like. My problem is with the Engine pad, since I have not seen a BB engine pad that was not perfectly rectangular. I have owned two very original 454 cars this year, and both had perfectly rectangular pads.

    I have attached a photo and would appreciate any opinions on this pad. I am not 100% sure on the stamping, but the VIN area looked perfect to me, although I'm not sure about the two number 1s in the Date, as mine have all had the 1 looking like the capital letter I.

    Could this be a block from a truck, and not a passenger car? Could it be a casting anomaly?

    I have also attached a photo of the 72 LS5 that I owned, which was owned by an older woman for 40 years, which I believe is definitely the original block.

    Your opinions are appreciated.

    Thank you,

    Steve

    Steve------


    Is the "CZU" block a GM casting #3963512 as it should be? I have never seen a 3963512 block with an engine pad configuration as pictured. The pad configuration should be a function of the casting number and not related to what chassis the engine was originally installed in. I can't explain it, though.
    In Appreciation of John Hinckley

    Comment

    • Steven S.
      Frequent User
      • June 27, 2013
      • 86

      #3
      Re: Engine Pad BB Anomaly? Not Rectangular?

      Hi Joe,

      The block is a 3963512 casting, dated late November 1969.

      Steve

      Comment

      • Philip A.
        Expired
        • February 26, 2008
        • 329

        #4
        Re: Engine Pad BB Anomaly? Not Rectangular?

        I can not comment on authenticity of stampings, as I am no expert. I would think it is possible that the outer part of the pad broke on stamping and the factory dressed it by grinding. There have been stories of the factory grinding out stamp errors and re stamping

        Comment

        • Kenneth B.
          Extremely Frequent Poster
          • August 31, 1984
          • 2084

          #5
          Re: Engine Pad BB Anomaly? Not Rectangular?

          As I said on the CF nothing is missing. Not all of the machine stock was remover when the water pump pad was machined. The block was probably back in the fixture so not all the extra machine stock was removed. Its like the glass half empty/full. In this case the pad is NOt missing anything but has some added stock left on.
          65 350 TI CONV 67 J56 435 CONV,67,390/AIR CONV,70 454/air CONV,
          What A MAN WON'T SPEND TO GIVE HIS ASS A RIDE

          Comment

          • Joe R.
            Extremely Frequent Poster
            • July 31, 1976
            • 4547

            #6
            Re: Engine Pad BB Anomaly? Not Rectangular?

            There is a lot of flashing associated with this type of casting. The casting are ground via hand to remove most of the casting flaws and flashing around the edges.
            I have witnessed this in a Ford plant. I'm sure the process is no different in any GM or Chrysler production facility.

            JR

            Comment

            • Joe L.
              Beyond Control Poster
              • February 1, 1988
              • 43193

              #7
              Re: Engine Pad BB Anomaly? Not Rectangular?

              All------

              It appears to me that the widest portion of the stamp pad in question is the "standard" width for the pad on a '512' block. The narrower section does not appear to me to have been created by any grinding. It appears to me to have been cast that way. Note the small but smooth radii at either end of the narrow portion. I don't think that could have been created by grinding. If we could see a frontal view of the pad in the narrow area that might settle it, though.
              In Appreciation of John Hinckley

              Comment

              • Kenneth B.
                Extremely Frequent Poster
                • August 31, 1984
                • 2084

                #8
                Re: Engine Pad BB Anomaly? Not Rectangular?

                Originally posted by Joe Lucia (12484)
                All------

                It appears to me that the widest portion of the stamp pad in question is the "standard" width for the pad on a '512' block. The narrower section does not appear to me to have been created by any grinding. It appears to me to have been cast that way. Note the small but smooth radii at either end of the narrow portion. I don't think that could have been created by grinding.
                The with of the pad is determined by the placement of the head as there is No inside edge. As I said the casting was not centered in the fixture for machining so it moved all the machining/drilling forward so the pad looks smaller from the head forward. The fillet/radii you see is from the end of the block stamp pad face to the machine stock pad & is a as cast surface. On correctly centered castings the machined water pump pad will be machined flush with the as cast stamp pad face. It has nothing to do with grinding.
                65 350 TI CONV 67 J56 435 CONV,67,390/AIR CONV,70 454/air CONV,
                What A MAN WON'T SPEND TO GIVE HIS ASS A RIDE

                Comment

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