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Old May 14, 2021 | 03:00 PM
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Hello Forum,
I saw a 2818-1 with a list of C276.
I know A and B are November December but what is C?
TIA,
Marshal
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Old May 14, 2021 | 03:03 PM
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I am going to say that is a four digit date code which makes it a service carb
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Old May 15, 2021 | 03:33 AM
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It is probably a zero not a C that is the Julian calendar date which would be 027 day of 1976,86, or 96.
Fixed! too early today!

Last edited by 65 Pro Vette; May 15, 2021 at 10:49 AM.
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Old May 15, 2021 | 10:29 AM
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In Julian dating, the first three digits represent the days of the year, and the fourth digit is the year. Julian dating began around 1972-73. Assuming a "0" as the first digit (likely), that would make the date January 27, 1976.

Larry

Last edited by Powershift; May 15, 2021 at 10:34 AM.
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Old May 15, 2021 | 04:57 PM
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Originally Posted by 65 Pro Vette
It is probably a zero not a C that is the Julian calendar date which would be 027 day of 1976,86, or 96.
Fixed! too early today!
they didnt use Julian dating til 72 or 73. That 2818 Holley with the GM part number I think makes it a March 27,1966. And the part # is correct for a 350/327 engine. JMHO

Last edited by vettsplit 63; May 15, 2021 at 05:01 PM.
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Old May 15, 2021 | 05:04 PM
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Originally Posted by vettsplit 63
they didnt use Julian dating til 72 or 73. That 2818 Holley with the GM part number I think makes it a March 27,1966. And the part # is correct for a 350/327 engine. JMHO
no it can’t be as up until 69 or so Holley only used a three digit date formate. After that it went to four
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Old May 17, 2021 | 08:50 AM
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Ok so the jury is still out on this one?
I believe the zero digit is correct I did not think of that when posting. So it would be a post 1972-73 built carb if I understand all the responses correctly?
TIA,
Marshal
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Old May 17, 2021 | 09:30 AM
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Originally Posted by marshal135
Ok so the jury is still out on this one?
I believe the zero digit is correct I did not think of that when posting. So it would be a post 1972-73 built carb if I understand all the responses correctly?
TIA,
Marshal
What is there to argue?? With four digits for the date code, the carb was made after 1973. Julian dating for Holley carbs has first three digits as the day of the year, and the fourth digit as the year.

Saying that, the year could be 1976 or 1986...............but most likely 1976.

My own 1967 car has a similar Holley #3810 service dated carb from 1977. It reads #2587 (day 258 in year 1977).

Larry
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Old May 17, 2021 | 06:36 PM
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Thankyou Larry.
You explained it well.
Marshal
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