Holley 3247 carburetor "EI" stamping

[Jim L.]

This is in reference to the 3247 carburetor, GM stamped number.
The JG makes no mention in my guide of the EI stamped after the GM number.
I have a September build car and the carburetor is as best I know the original factory installed unit for a L72.
My research indicates there are 3 generations of the 3247 main body. It has a casting number as follows...6R 2829B
Now, I've observed the differences being at the base of the casting the object of variances on the what I call first and second
generations. The 2nd gen also has the "EI" stamped after the GM 7 digit number. The 3 gen has a different cast number & was more likely a much later rendition not used on the production line for 1966.
So, my question is, were early production cars (Sept to Dec.) without the "EI" stamped and are there verified examples besides the one pictured in the JG? I await someones response to my inquiry, thank you for any feedback you can offer to me.
Jim L.
17092

[Pete L.]

Re: Holley 3247 carburetor "EI" stamping

Jim,
My 3247 carb, dated 504, does not have an "EI" stamped on Horn. The number stamped on my carb is, 3886101
Not sure if I am responding to your specific question.

Pete

[Ray K.]

Re: Holley 3247 carburetor "EI" stamping

Jim
The 3247 that I have is referenced as follows ---- 3886101 -EI
List 3247
983
This would appear to a service carb because of the production date.

Ray

[Mike M.]

Re: Holley 3247 carburetor "EI" stamping

i've had two 66 425' with their original 3247 carbs. both were fall of 65 production. neither had the "EI" stamped on them. mike

[Jim L.]

Re: Holley 3247 carburetor "EI" stamping

Thanks to all for responding...
This is a unmolested carburetor and the give-away for me was the short linkage (on drivers side viewing) from the main throttle arm connecting to the secondary throttle arm. It uses 2 cotter pins to retain it (one on each end). Whereas the next generation only requires 1 carter pin & uses a flattened end to retain it to the secondary shaft apparatus. There are approximately 5 other differences based on this 1st generation compared to the 2nd gen. There is no gold dichromate color but more of a green hue to the major components. I could go on with what this carburetor can tell us before restoration makes it all go away ( original comes only once, after that, it becomes a restorer embellishment ).