!972 Rochester 7042203
Thread Starter
Burning Brakes
Joined: Oct 2018
Posts: 1,031
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From: Henderson, NV
St. Jude Donor '19-'20-'21-'22
!972 Rochester 7042203
If I were to search for the correct carburetor for my 72, which was manufactured approx. Oct 25th, 1971, what date codes would I be looking for on the carb?
I know the correct part is 7042203, but I see folks searching for date correct carburetors. The date shouldn't be an exact match to the cars manufacturing date should it?
I would think the carb should have an earlier date than the car. I'm just curious about how one calculates the correct date code.
Any input is appreciated.
Thanks!
I know the correct part is 7042203, but I see folks searching for date correct carburetors. The date shouldn't be an exact match to the cars manufacturing date should it?
I would think the carb should have an earlier date than the car. I'm just curious about how one calculates the correct date code.
Any input is appreciated.
Thanks!
Tech Contributor
Joined: Aug 1999
Posts: 14,382
Likes: 6,401
From: At my Bar drinking and wrenching in Lafayette Colorado
If your car was assembled ("born on") October 25th, the carb can have been built as tight to that date as 1 week (although not common), but usually 2 weeks or more prior to the build date. It's not likely that it would have been built more than a few months prior to the vehicle assembly date. Keep in mind that the carb was installed to the engine at the vehicle assembly plant, and not at the engine assembly plant, so the carb and the engine would have been built in parallel and do not have to be in sequence, as long as neither date is after the vehicle assembly date or much less than 1 week prior to the "born on" date. 
Lars
Edit 10/31:
I just realized that your car's "born on" date makes it a very early production car. Since the 7042203 is specifically a '72 carb, you actually don't have to worry about getting one that's built "too early," since your car could have used any carb built for the '72 model year up until about a week prior to your assembly date.
Lars
Edit 10/31:
I just realized that your car's "born on" date makes it a very early production car. Since the 7042203 is specifically a '72 carb, you actually don't have to worry about getting one that's built "too early," since your car could have used any carb built for the '72 model year up until about a week prior to your assembly date.
Last edited by lars; Oct 31, 2018 at 10:44 AM.
Thread Starter
Burning Brakes
Joined: Oct 2018
Posts: 1,031
Likes: 465
From: Henderson, NV
St. Jude Donor '19-'20-'21-'22
Thanks Jack.
I guess I would be looking for a 7042203 with a date before or in October 1971 as the estimated build date for my (1972) car is Oct. 25, 1971.
As Lars posted, I don't think I need to worry about having a date code that's too early as my car is an early production number (05678)
I guess I would be looking for a 7042203 with a date before or in October 1971 as the estimated build date for my (1972) car is Oct. 25, 1971.
As Lars posted, I don't think I need to worry about having a date code that's too early as my car is an early production number (05678)
Last edited by fastimes; Nov 30, 2018 at 01:44 PM.
Burning Brakes
Joined: Jan 2009
Posts: 766
Likes: 97
From: Lake Norman, NC
If I were to search for the correct carburetor for my 72, which was manufactured approx. Oct 25th, 1971, what date codes would I be looking for on the carb?
I know the correct part is 7042203, but I see folks searching for date correct carburetors. The date shouldn't be an exact match to the cars manufacturing date should it?
I would think the carb should have an earlier date than the car. I'm just curious about how one calculates the correct date code.
Any input is appreciated.
Thanks!
I know the correct part is 7042203, but I see folks searching for date correct carburetors. The date shouldn't be an exact match to the cars manufacturing date should it?
I would think the carb should have an earlier date than the car. I'm just curious about how one calculates the correct date code.
Any input is appreciated.
Thanks!
Hi Fastimes.
I see you have identified the needed part number for your car as 7042203. This part is specifically for the base engine (350ci/200hp) with manual transmission and without A.I.R. (air injection reactor) system. There were a total of 7 different carburetor variations for 1972 model year.
I thought I'd post this to help make sure you're on the right path as you conduct your search. You've gotten great advice already on dates. NCRS judging guides give a 6 month to (I think) 2 day advance dating vs build on most components. As has been pointed out, this component should be in advance of your engine's build date. If you don't already know, your engine's build date is coded on the cylinder casing's stamp pad.
Hope this helps...
Last edited by redrdstr72; Dec 1, 2018 at 09:42 AM.
Thread Starter
Burning Brakes
Joined: Oct 2018
Posts: 1,031
Likes: 465
From: Henderson, NV
St. Jude Donor '19-'20-'21-'22
Hi Fastimes.
I see you have identified the needed part number for your car as 7042203. This part is specifically for the base engine (350ci/200hp) with manual transmission and without A.I.R. (air injection reactor) system. There were a total of 7 different carburetor variations for 1972 model year.
I thought I'd post this to help make sure you're on the right path as you conduct your search. You've gotten great advice already on dates. NCRS judging guides give a 6 month to (I think) 2 day advance dating vs build on most components. As has been pointed out, this component should be in advance of your engine's build date. If you don't already know, your engine's build date is coded on the cylinder casing's stamp pad.
Hope this helps...
The Quadrajet that is on the car is a replacement, Lord knows where that came from. I can't can't find numbers matching that thing anywhere online.
Hopefully finding a properly dated carb for an early build 1972 won't be too hard (or expensive).
Burning Brakes
Joined: Jul 2014
Posts: 818
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From: Lancaster Ohio
They are out there. My 72 was born on Aug 24 of 71. Very early. It took me a year to find one because it is so early. Look on eBay etc. or post a wanted ad here. I have a couple extra 7042203 carbs. Let me check the dates.
Thanks
Joey
Thanks
Joey
Tech Contributor
Joined: Aug 1999
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From: At my Bar drinking and wrenching in Lafayette Colorado
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Burning Brakes
Joined: Jan 2009
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From: Lake Norman, NC
Not to highjack "fastimes'" thread but in hoping it helps him find the right carb for his engine:
My car is only 1 day older than yours (build date August 23, 1971) and its known-original carb is dated G1.
Hope this helps.
Thread Starter
Burning Brakes
Joined: Oct 2018
Posts: 1,031
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From: Henderson, NV
St. Jude Donor '19-'20-'21-'22
Thread Starter
Burning Brakes
Joined: Oct 2018
Posts: 1,031
Likes: 465
From: Henderson, NV
St. Jude Donor '19-'20-'21-'22
Thanks Lars. Here is the number on my carb, the 6th and 7th characters are not legible: "71112?? FA". Bottom number 0951
I have past service records showing that the original carburetor was replaced with an Edelbrock, then a few years later replaced with this Quadrajet.
I tried researching the number online, but came up with nothing. Any info you may have would be appreciated.
Last edited by fastimes; Dec 2, 2018 at 12:42 AM.
Tech Contributor
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From: At my Bar drinking and wrenching in Lafayette Colorado
It's a commercially rebuilt "mix-n-match" carb where the builder has hacked together several carbs from different years. The float bowl is a 1971 Chevy (built the 95th day of 1971). They mixed this with a 1972 - 74 airhorn and choke system. You don't have any photos showing the throttle plate, so I can't tell you what that is, but you have a messed up carb pieced together and hacked pretty bad... Time to look for a good carb...
Lars
Lars
Thread Starter
Burning Brakes
Joined: Oct 2018
Posts: 1,031
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From: Henderson, NV
St. Jude Donor '19-'20-'21-'22
Thank you Lars! I appreciate you giving me that info.
From my records, I know the original carb was pulled and replaced with an Edelbrock. They ran that for a few years and put this Frankensteined Rochester on it.
I'll start my search for a proper 7042203 for my Oct. 1971 build date.
From my records, I know the original carb was pulled and replaced with an Edelbrock. They ran that for a few years and put this Frankensteined Rochester on it.
I'll start my search for a proper 7042203 for my Oct. 1971 build date.
Thread Starter
Burning Brakes
Joined: Oct 2018
Posts: 1,031
Likes: 465
From: Henderson, NV
St. Jude Donor '19-'20-'21-'22
Thread Starter
Burning Brakes
Joined: Oct 2018
Posts: 1,031
Likes: 465
From: Henderson, NV
St. Jude Donor '19-'20-'21-'22
Burning Brakes
Joined: Jul 2014
Posts: 818
Likes: 70
From: Lancaster Ohio