Spark plug date code on boxes - NCRS Discussion Boards

Spark plug date code on boxes

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  • Mark Milner

    Spark plug date code on boxes

    I used to know this, but I guess age is creeping up here.

    How do you decipher the date codes on the spark plug boxes, both the individual and the big box?

    Thanks.
  • Jack H.
    Extremely Frequent Poster
    • April 1, 1990
    • 9906

    #2
    Re: Spark plug date code on boxes

    Look for a 'clock' pattern. Should have the year of mfgr in large numbers in the center of the clock surrounded by individual month numbers in a circular pattern. If I recall correctly, individual month numbers were removed from the circular pattern as each month of production expired.

    Comment

    • Jeffrey S.
      Extremely Frequent Poster
      • May 31, 1988
      • 1879

      #3
      Re: Spark plug date code on boxes

      Mark:
      On the small boxes there are numbers up to 12 and the last 2 digits of a year. The first number in the list to 12 is the month. They start in Jan with 1 through 12 listed and delete one each month. If the numbers run from 6 to 12 then the box was printed in June of the year listed. This only the printing of the box- not necessarily the manufacture of the spark plug. The large boxes I have are marked this way also and some are marked with just the month outside a cicular logo with the year inside the logo.
      Jeff

      Comment

      • Mark Milner

        #4
        Re: Spark plug date code on boxes

        Thanks, Jack and Jeff.

        The boxes I have a single number inside the clock. They are old ACniter and Fire Ring boxes in the familiar AC blue and white box.

        Comment

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