1957 EG Block

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  • Dan P.
    Very Frequent User
    • December 1, 1990
    • 683

    1957 EG Block

    I am trying to find A originallate EG stamed block so I can look at the G.
    I have examples of A May 56 and A March 57 Block's and the G is straightback.The only late example I have is on A passenger car block and the G is curved back and the G is the 5th letter so it is gang stamepd.This is what I think. If the G was gang stamped with the holder for 5 characters it was rounded backed .But if the G was the 6th letter and hand stamed it was straight backed . Does anyone have A July or August original EG block they could look at. Thanks in advance
  • Jack H.
    Extremely Frequent Poster
    • April 1, 1990
    • 9906

    #2
    Re: 1957 EG Block

    Passenger car blocks are resonably safe educational role models for Corvette, provided they're Saginaw/Flint vs. Tonawanda blocks! The same stamping tools were used...

    The caveat is knowing that GM didn't have just ONE 'G' stamping die (or for that matter '1', '3', '6' and all the other letters/characters). So, reading the actual stamping date and taking that aspect into consideration for your target Corvette matters!

    You want to get as close in time with the passenger car block 'template' as you can to your target Corvette. Why? Stamping dies wore out, broke, and were swapped around position wise with respect to time of use...

    Comment

    • Edward M.
      Extremely Frequent Poster
      • November 1, 1985
      • 1915

      #3
      Re: 1957 EG Block

      Dan;

      Are you saying that the G as the last letter in the suffix code for a 57 Corvette was stamped individually?

      I am aware that the 'L' character for the EL suffix code was stamped separately, but I thought the other 57 Corvette suffix codes were all stamped in a gang holder.

      The 57 Corvette engine codes would be either six or seven characters, depending on whether the month has one or two digits (i.e. F512EG vs. F1012EG).

      I think that all six or seven characters were in a gang holder. Am I wrong on this?

      Inquiring minds.....

      Comment

      • Dan P.
        Very Frequent User
        • December 1, 1990
        • 683

        #4
        Re: 1957 EG Block

        Originally posted by Edward McComas (9316)
        Dan;

        Are you saying that the G as the last letter in the suffix code for a 57 Corvette was stamped individually?

        I am aware that the 'L' character for the EL suffix code was stamped separately, but I thought the other 57 Corvette suffix codes were all stamped in a gang holder.

        The 57 Corvette engine codes would be either six or seven characters, depending on whether the month has one or two digits (i.e. F512EG vs. F1012EG).

        I think that all six or seven characters were in a gang holder. Am I wrong on this?

        Inquiring minds.....
        Acording to the new JM the holder only held 5 characters and the 6th was hand stamped.The example they show is A EH the H does not line up.I have A EH block that A NCRS and Bloomington judge said he would pass it and its way off and stamep deaper .

        Comment

        • John H.
          Beyond Control Poster
          • December 1, 1997
          • 16513

          #5
          Re: 1957 EG Block

          Ken Kayser covered the steel-stamping of engine pads at Flint V-8 from '55-'57 in great detail in the May, 2003 and June, 2003 issues of "Vette Vues" ('55-'56 in the May issue, '57 in the June issue), including the Engineering direction to use the letter "I" instead of the number "1" in all instances at both Flint V-8 and Tonawanda.

          Paraphrasing from Ken's June article on '57 stamping:

          The 1956 5-die gang-holders were rebuilt in the Toolroom to hold six dies.

          Single-character suffix gang holders (95% of production) were set up to use a blank spacer die as the last character in a single-digit month (O thru 9), and all six dies were used during two-digit months.

          All RPO engines with a 2-character suffix had the second suffix character hand-stamped with a set of 8.5"-long single character dies; all Corvette engines had 2-character suffixes.

          Six pages of Ken's June article are dedicated solely to the stamp dies, with amazing detail on how to authenticate a 1957 stamp. The article goes on to indicate that the gang holders were revised again in March, 1958 to hold seven dies (so 2-character suffixes could be stamped without manually stamping the last character), and were revised again in 1964 to hold eight dies to accommodate 3-character suffixes.

          Comment

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