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C3 Head Dates

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  • James Keddie
    #1

    C3 Head Dates

    Help please in decoding the numbers on my SB heads. They are marked as follows:
    Passenger Side
    GM 3927186
    56 E130

    Driver Side
    GM 3927186
    55 D280

    Thank you, Jim 42765
    Tags: None
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    • John H.
      Beyond Control Poster
      • December 1, 1997
      • 16513
      #2
      Re: C3 Head Dates

      Jim -

      Those heads were cast on April 28th and May 13th, 1970; they were used (on Corvettes) on up to 350hp engines in 1969 and 1970, and had many other applications on various passenger cars.
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        • James Keddie
          #3
          Re: C3 Head Dates

          Thanks John!

          The build date on my '70 convert 350/300 is May 27th, with the engine build of May 18th, so the heads look like they maybe OE.

          Jim
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