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Author Topic: GM key Codes  (Read 207 times)

Burd

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GM key Codes
« on: November 09, 2013, 03:30:13 PM »

                              B&S**
Application* Designation Blank  Groove  Years***
------------ ----------- ------ ------- -------------------
Primary****  -              -     15    1935-1966

Primary      A           320296   50    1967
Secondary    B           320298   51

Primary      C           320368   54    1968
Secondary    D           320369   55

Primary      A           320588   50    1971 1975 1979
Secondary    B           320589   51    and 1983-1986

Primary      C           320652   54    1972 1976 1980
Secondary    D           320653   55    1987-1990

Primary      E           320404   56    1969 1973 1977 1981
Secondary    H           320405   57    and some 1991-1999

Primary      J           320470   58    1970 1974 1978 1982
Secondary    K           320471   59    *****
------------------------
    *Through 1974, the Primary key was applied to the
     Ignition and Doors, while the Secondary was applied to
     the Trunk and Glovebox. Starting in 1975, the Primary
     key was used only in the Ignition, while the Secondary
     key was used in the Doors and Trunk.
   **Aftermarket manufacturers often use a different groove
     numbering system, such as the "EZ" system. For a given
     key blank, the EZ System groove numbers are different
     than the OEM B&S groove numbers for the same key
     blank.
  ***Dates are generally correct, but may vary for early and
     late models in a model year, or for fleet and law
     enforcement vehicles.
 ****Many models prior to 1967 used only one key with an
     octagonal key bow. If there was a secondary key, it
     used the same key blade with a different cut and a
     teardrop-shaped key bow.
*****Modern use of the J/K keyways is still uncertain
     and is being researched by CRG.
« Last Edit: March 27, 2014, 08:56:01 PM by BURD »
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1978 YEE

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