Carb date code
Race Director
Joined: Apr 2005
Posts: 11,276
Likes: 2,138
From: Bowling Green, Kentucky
If the date code has FOUR digits, it was built in the mid-70's or later (more recent). That code is Julian day of the year (3 digits) and year (last digit). So 3606 would be the 360 day of 1976 or 1986 or 1996 or 2006. You get to guess at the decade.
Larry
Instructor
Joined: Dec 2000
Posts: 190
Likes: 8
From: Clovis NM
There's a three digit number on the face of the air horn. Normal Holley date code is deciphered as follows:
The 1st digit refers to the last digit of the calendar year
The 2nd character represents the month
The 3rd digit represents the week of the month
Example: 543
5 = 1965
4 = April
3 = 3rd week of April
The second digit uses 0 for October, A for November, B for December
The 1st digit refers to the last digit of the calendar year
The 2nd character represents the month
The 3rd digit represents the week of the month
Example: 543
5 = 1965
4 = April
3 = 3rd week of April
The second digit uses 0 for October, A for November, B for December
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