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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 
    B - Bay City
    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
    D - 402 engine
    F - 454 engine

    Date of Build
    Three digit Julian date starting with Jan 1, 1970

    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

  • Recent Posts

    • Marks71
      Newbie 1970

      By Marks71 · Posted

      Willie, I went through my build sheet for my 71, and as Glen said, there’s nothing that addresses the s/b holders for the console.i just assumed that at least on the 71s, they all had them. My first 71 that I bought in 74 had them. As for the chrome trim, I’m sure it was necessary to keep the mounting screws from pulling through the somewhat soft material the cups were made of over time.
    • Glen
      Newbie 1970

      By Glen · Posted

      No worries, Willie. I wonder if they were just automatically installed when the car was optioned with the console.  
    • willie
      Newbie 1970

      By willie · Posted

      Thanks Glen i checked mine and i didn't see anything either. So i am guessing they were in some kind of package also. We now know the rears are most likely dealer or after market items. But i was just wondering about the front console ones??
    • Glen
      Newbie 1970

      By Glen · Posted

      Willie, I see nothing obvious on the ‘70s Build Sheet that would lead me to believe it appeared as a “code”.  I’d ASSUME that if it did appear it might be logical to be located near the seatbelt boxes (#87 and #88). For what it’s worth, there ARE seven boxes missing on the BS, so I guess there’s always the possibility it may have populated one of those.  The picture I have for the ‘71 is garbage… so blurry it resembles hieroglyphics. I’ll have to check that another time and get back to you. 
    • Wd71MC
      Newbie 1970

      By Wd71MC · Posted

      Welcome to the group nice Monte.
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