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  • Decoding 1972 Protect-O-Plate

     

    1972 Labelled Sample.png

    Note that there are some plates that do not have all of these details but it is not common.

  • Vehicle Identification Number
    See VIN decode page

    Carburetor Manufacturer 
    C - Carter                
    R - Rochester

    Engine Info
    Assembly Plant
    F or V - Flint, Michigan
    K - McKinnon Industries
    T - Tonawanda Engine Plant

    Assembly Date
    Month
    01 - January
    02 - February
    03 - March
    04 - April
    05 - May
    06 - June
    07 - July
    08 - August
    09 - September
    10 - October
    11 - November
    12 - December
    Day   
    01 to 31

    Engine Suffix Code
    CDA - 350 ci 2-barrel with manual trans
    CDD - 350 ci 4-barrel with TH 350 trans
    CDG - 350 ci 2-barrel with manual trans
    CKA - 350 ci 2-barrel with manual trans
    CKB - 350 ci 2-barrel with TH 350 trans
    CKD - 350 ci 4-barrel with TH 350 trans
    CLB - 402 ci 4 barrel with TH 400 trans
    CMD - 350 ci 2-barrel with TH 350 trans
    CPD - 454ci 4 barrel with TH 400 trans
    CRW - 454ci 4 barrel with TH 400 trans
    CTB - 402 ci 4 barrel with TH 400 trans
    CTL - 350 ci 2-barrel with TH 350 trans

    Rear Axle Info
    Axle Prefix Code
    CF - 3.31:1 with Positraction        
    CH - 2.73:1 with Positraction        
    CW - 3.31:1        
    GA - 2.56:1        
    GB - 2.56:1 with Positraction        
    GC - 2.73:1        
    GD - 2.73:1 with Positraction        
    GH - 2.73:1
    KD - 2.73:1   
    RU - 3.31:1        
    RV - 3.31:1 with Positraction

    Assembly Plant
    C - Buffalo, NY            
    G - Chevrolet Gear & Axle            
    W - Warren, MI            
    K - McKinnon Industries

    Assembly Date
    Three digit Julian date starting with Jan 1, 1970
    Example: 028 is January 28, 1970. 365 is December 31, 1970.

    Shift
    1 - First shift
    2 - Second shift
    Note that not all plates have shift codes

    Positraction Code
    E - Eaton Positraction

  • Assembly Month
    H - August
    J - September
    K - October
    L - November
    M - December            
    A -January            
    B - February            
    C - March            
    D - April            
    E - May            
    F - June            
    G - July

    Transmission Info
    Turbo Hydra-Matic 400

    Model year
    72 - 1972 model year

    Engine Type
    D - 402 engine
    F - 454 engine

    Date of Build
    Three digit Julian date starting with Jan 1, 1969

    All other transmissions

    Assembly Plant and Transmission Type
    B - Cleveland Turbo Hydramatic 350        
    D - Sagiunaw 3-speed manual
    J - GM of Canada Turbo Hydramatic 350
    K - McKinnon Industries 3-speed Manual        
    M - Muncie 3-speed manual        
    O - Saginaw
    S - Saginaw 3-speed manual
    W - Warner Gear 3-speed manual
    Y - Toledo Turbo Hydramatic 350

    Year            
    2 - 1972 model year        

    Assembly Month            
    M - August
    P - September    
    R - October    
    S - November    
    T - December    
    A - January    
    B - February    
    C - March    
    D - April    
    E - May    
    H - June    
    K - July

    Assembly Day
    01-31

    Assembly Shift
    D - Day shift
    N - Night shift
    Note not all plates have shift codes

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