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  • Decoding 1970 Protect-O-Plate

     

    1970 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
    CKN - 402 ci 4 barrel with TH 400 trans
    CKR - 402 ci 4 barrel with manual trans
    CNI - 350 ci 2 barrel with manual trans
    CNJ - 350 ci 4 barrel with manual trans
    CNK - 350 ci 4 barrel with Powerglide trans
    CNM - 350 ci 2-barrel with Powerglide trans
    CNN - 350 ci 2-barrel with TH 350 trans
    CRE - 350 ci 4-barrel with TH 350 trans
    CRH - 400 ci 2-barrel with TH 350 trans
    CRN - 454 ci 4-barrel with TH 400 trans
    CZX - 400 ci 2-barrel with manual trans

    Rear Axle Info
    Axle Prefix Code
    CCF - 3.31:1 with Positraction        
    CCH - 2.73:1 with Positraction        
    CCN - 2.56:1        
    CCO - 2.56:1 with Positraction        
    CCP - 2.73:1        
    CCW - 3.31:1        
    CGA - 2.56:1        
    CGB - 2.56:1 with Positraction        
    CGC - 2.73:1        
    CGD - 2.73:1 with Positraction        
    CKC - 2.73:1 with Positraction        
    CKD - 2.73:1        
    CRJ - 2.56:1        
    CRK - 2.56:1 with Positraction        
    CRU - 3.31:1        
    CRV - 3.31:1 with Positraction

    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

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

  • Assembly Month
    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
    70 - 1970 model year

    Engine Type
    C - 402 engine
    R - 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        
    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            
    0 - 1970 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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