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Chevrolet Holley Carburetors

 

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Holley Carburetor Numerical Listing (Requires Adobe Reader).

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Holley Three-Digit Date Codes - Through 1972

1st Digit

2nd Digit

3rd Digit

Stamp Year Stamp Month Stamp Week
4 1964 1 January 1 1st week
5 1965 2 February 2 2nd week
6 1966 3 March 3 3rd week
7 1967 4 April 4 4th week
8 1968 5 May 5 5th week
9 1969 6 June    
0 1970 7 July    
1 1971 8 August    
2 1972 9 September    
    0 October    
    A November    
    B December    

 

 



Holley Four-Digit Date Codes - 1973 and later

First Three Digits

Fourth Digit
Julian Date Stamp Month Year
Regular Year Leap Year   Stamp Year
001-031 001-031 January 1973
032-059 032-060 February 4 1974
060-090 061-091 March 5 1975
091-120 092-121 April 6 1976
121-151 122-152 May 7 1977
152-181 153-182 June 8 1978
182-212 183-231 July 9 1979
213-243 214-244 August 0 1980-1990
244-273 245-275 September 1 1981-1991
274-304 276-305 October 2 1982-1992
305-334 306-335 November    
335-365 336-366 December    


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