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69 / 70 Quadrajet ID number and build date

1287 Views 11 Replies 4 Participants Last post by  marcrose
Trying to decode the ID number on a Quadrajet
7040204 FF dated 0429

The “0” in 7040204 = 1970 Chevy

But the assembly date code has me confused ?
"042" was posted in the ad by the owner

042 = 42 day of the year carb was assembled
9 = 1969

That would be way to early in 1969 to be assembled on a 1970

Is it possible the first number in the “042” is not a zero ?
This is the picture posted on Craigs list.... its hard to tell ?

If it’s a 3 then the unit was assembled in Dec of 1969 to be used on an early 1970 car
I'm trying to locate a 7040204 carb for a March 09 1970 engine build
If it is a 3 would this still be to early for the build date I'm looking for

Thanks for taking the time to look - Bob Tire Automotive tire Bumper Tread Automotive exterior

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Below is the breakdown of the number...Feb of 69 is to early for a March built car. I don't think it's a zero look at the 04 on the part number...the 0 has a considerable space between it and the top of the 4. On the date you can see a slight tooling mark for a number...if it was a zero I don't think the mark would be visible. Good Luck.


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I think you need to be in the Late Feb ballpark or early March.

Both of my cars are # matching cars...#1 is a two owner 65K mile car...original in every detail except the 35yo paint. #2 was restored but, retains all of it's original accessories (minus water/fuel pump...the normal stuff that wears out).

You can see the dates on the carbs are really close to the build date of the engine...This may be a fluke but, unless someone else has more insight on carb dates...I'd use the below as a good reference.

1. 13 Oct built engine with an 02 Oct dated Carb. (11 day Diff)...Car Assembled 4th week of Oct 1969
2. 02 April built engine with a 24 March dated Carb. (9 Day Diff) Car Assembled 2nd week of Apr 1970

Just a note...Not sure how much the seller wants for the carb...but, if you've been looking then you know they can be close to 2K..especially an 7040205 manual transmission carb. If it's a really good price...I'd purchase it and use it to bargain/trade for what you need.

That's a good deal...I'd snap it up.

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