Need Help Interpreting Carb Date Codes

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Dec 24, 2008 | 12:05 AM

70Yellowbird

Thread Starter

Burning Brakes

Joined: Feb 2008

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From: Oswego New York

Need Help Interpreting Carb Date Codes

The original carb on my '70 sb has a Rochester Quadrajet body #7040213 and date code EO DG.

I am looking at a spare with the same body #, and has date code BO DG.

With a car build date of F03 (June 3), can anyone advise if the carb that I'm looking at would be considered 'correct'?

I did a search before I posted this question ... and found some good info, but I'm still not sure what date these carbs were built, nor what a reasonable carb date code would be for my June 3 build.

Any help would be much appreciated.

Dec 24, 2008 | 08:41 AM

papawana

Safety Car

Joined: Oct 1999

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From: Florida

carb

Corvette By The Numbers by Colvin says:
B0=Feb 1970
E0=May 1970

Quote:

Originally Posted by 70Yellowbird

Dec 24, 2008 | 09:25 AM

Mashman

Melting Slicks

Joined: Mar 2008

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From: Austin Tx

For carb dates the 6 month window is used - so a Feb carb could be considered correct on a Jun built car.

Dec 24, 2008 | 09:46 AM

Easy Mike

Team Owner

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From: Southbound

Cruise-In II Veteran

Quote:

Originally Posted by Mashman

For carb dates the 6 month window is used - so a Feb carb could be considered correct on a Jun built car.

But closer is better. Another May date would be ideal.

Dec 24, 2008 | 09:56 AM

70Yellowbird

Thread Starter

Burning Brakes

Joined: Feb 2008

Posts: 1,042

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From: Oswego New York

Thanks very much to papawana, Marshman, and Easy Mike for your help. I'll have to add 'Corvette By The Numbers' to my wish list.

Dec 24, 2008 | 05:53 PM

Alan 71

Team Owner

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From: Westminster Maryland

Hi 70Y,
I believe your carburetor is a CARTER built quadrajet.
The CARTER built quadrajets have a month/year code as you posted.
The ROCHESTER built quadrajets have a a jullian date, for example ...1230, the one hundred, twenty-third day of 1970.
I'm not sure what % of carbs where made by each manufacturer.
Merry Christmas!
Regards,
Alan

Dec 25, 2008 | 01:41 PM

70Yellowbird

Thread Starter

Burning Brakes

Joined: Feb 2008

Posts: 1,042

Likes: 19

From: Oswego New York

Quote:

Originally Posted by Alan 71

Thanks Alan, you are absolutely correct ... my original carb is a Carter. I don't know why I was thinking this, but I assumed that 'Quadrajet' and 'Rochester Quadrajet' were synonymous.

So ... does that mean that both manufacturers used the same part numbering system using different date code nomenclature, but perhaps used the same specs to manufacture the sub-components of a carb?

Dec 25, 2008 | 02:23 PM

Alan 71

Team Owner

Joined: Sep 2006

Posts: 31,316

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From: Westminster Maryland

Hi70Y,
I think you're right. This is a case of 2 suppliers building the same part number.
I guess the most famous example of this is the A.O.Smith built, complete bodies.
Merry Christmas!
Regards,
Alan