[bobm396]

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

 

[e0em9mlc]

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.

Mike

 

[bobm396]

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.

Mike


View attachment 703334

 

[bobm396]

Mike - Thank you for the quick response - Owner just got back to me and is going to double check the number. He thinks it may be a "3" not a "0". If it does turn out to be a "3" that would make it a Dec 1969 assembled carb. Do you think that's still to early to be installed on a March 09 1970 engine ? Thoughts Thanks

 

[e0em9mlc]

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

Mike

 

[e0em9mlc]

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.

Mike

 

[bobm396]

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.

Mike

 

[bobm396]

Thanks Mike - $500.00 complete carb needs to be rebuilt

 

[e0em9mlc]

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

Mike

 

[25C 70]

Bob my 70 SS 396 th400 with a 10D body and a 9/9/69 engine has a carb dated the 246th day of 69, September 3. Be sure to check the fuel inlet threads for wear.

 

[marcrose]

I wouldnt be to concerned with the build date.In 70 they had a small strike and parts were mass produced just in case.Carter even built some carbs for gm .Lots of nos build date carbs were not even put on the cars .I ve seen 7040204 ff carbs 3 -4 months early ,possibly more.Same as exhaust manifold date codes,all over the place.

 

[marcrose]

just a note ,alot of the 7040204 were missing the 7 on the carb stamp.