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Holley Three-Digit Date Codes

1st Digit

2nd Digit

3rd Digit

Stamp

Year

Stamp

Month

Stamp

Week

5

1965

1

January

1

1st week

6

1966

2

February

2

2nd week

7

1967

3

March

3

3rd week

8

1968

4

April

4

4th week

9

1969

5

May

5

5th week

0

1970

6

June

 

 

1

1971

7

July

 

 

2

1972

8

August

 

 

 

 

9

September

 

 

 

 

0

October

 

 

 

 

A

November

 

 

 

 

B

December

 

 

 

File Photo

072

0=2970

7=July

2=2nd week

 

1970 Z28

032

0=1970

3=March

2=2nd week

 

 

 

Holley Four-Digit Date Codes

First Three Digits

Fourth Digit

Julian Date Stamp

Month

Year

Regular Year

Leap Year

 

Stamp

Year

001-031

001-031

January

1973/1983/1993

032-059

032-060

February

4

1974/1984/1994

060-090

061-091

March

5

1975/1985/1995

091-120

092-121

April

6

1976/1986/1996

121-151

122-152

May

7

1977/1987/1997

152-181

153-182

June

8

1978/1988/1998

182-212

183-231

July

9

1979/1989/1999

213-243

214-244

August

0

1980/1990/2000

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

 

 

 

0348

034=February

8=1978