1981 Engine Codes - NCRS Discussion Boards

1981 Engine Codes

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  • John L.
    Very Frequent User
    • December 1, 1997
    • 409

    1981 Engine Codes

    I am looking at a corvette numbers book that claims there were supposedly 4 engine codes for the 81 corvette. As I remember there is only one engine option L81 350 ci 190 hp what do the 4 codes represent ?? ZDA, ZDB, ZDC, ZDD
  • Joe L.
    Beyond Control Poster
    • February 1, 1988
    • 43193

    #2
    Re: 1981 Engine Codes

    John-----

    ZDA= manual transmission, federal emissions

    ZDB= automatic transmission, California emissions

    ZDC= manual transmission, California emissions

    ZDD= automatic transmission, federal emissions

    The engines, as delivered from Flint engine, were configured for the 4 above applications. Thus, they were different assemblies and required different suffix codes to distinguish them.
    In Appreciation of John Hinckley

    Comment

    • John L.
      Very Frequent User
      • December 1, 1997
      • 409

      #3
      Re: 1981 Engine Codes

      Joe -- As always thanks for the response.

      Comment

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