Re: Holley Carbs
John, The number 3087 you are refering to is the date code of the carb.
Up through the end of 1972 Holley used a 3 digit date code telling year, month, and week of month carb was produced. As an example, 982 would read as 1969, August, and built during the second week.
From the beginning of 1973 Holley used a 4 digit date code telling the day of the year and the year.
Your example of 3087 reads as the 308th day of 1977, 1987, or 1997.
Hope this helps.
Disclaimer: Opinions expressed by me on this forum are exactly that, my opinions.
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