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  • Decoding 1971 Protect-O-Plate

    There are some differences in the layout between US built cars and Canadian built cars. Both layouts shown below.

    1971 United States Built Cars

    1971 Labelled Sample.png 


    1971 Canadian Built Cars

    1971C 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
    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
    CGA - 350 ci 2 barrel with manual trans
    CGB - 350 ci 2-barrel with Powerglide trans
    CGC - 350 ci 2-barrel with TH 350 trans
    CGK - 350 ci 4 barrel with manual trans
    CGL - 350 ci 4-barrel with TH 350 trans
    CJD - 350 ci 4-barrel with TH 350 trans
    CJJ - 350 ci 4 barrel with manual trans
    CLA - 402 ci 4 barrel with manual trans
    CLB - 402 ci 4 barrel with TH 400 trans
    CLL - 402 ci 4 barrel with manual trans
    CLP - 402 ci 4 barrel with manual trans
    CPD - 454ci 4 barrel with TH 400 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
    B - 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.

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

    Canadian Built Cars
    8 - August
    9 - September
    0 - October
    N - November
    D - December            
    1 -January            
    2 - February            
    3 - March            
    4 - April            
    5 - May            
    6 - June            
    7 - July

    Transmission Info
    Turbo Hydra-Matic 400

    Model year
    71 - 1971 model year

    Engine Type
    CD or D - 402 engine
    OF or 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        
    C - Cleveland Powerglide        
    E - McKinnon Industries Powerglide
    J - GM of Canada Turbo Hydramatic 350
    K - McKinnon Industries 3-speed Manual        
    P - Muncie 4-speed Manual        
    R - Muncie 4-speed Manual        
    S - Muncie 3-speed Manual        
    Y - Toledo Turbo Hydramatic 350

    Year            
    1 - 1971 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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