1973 Quadrajet Questions

[Tom K.]

Hello All,
I have a question regarding some markings on what I thought was the original carburetor for my car. The car has A/C and an automatic transmission. The markings shown in the pictures make me think maybe the carburetor was replaced at some point.
I rebuilt another carburetor as a temporary measure and I was planning to have the original one done by a pro with renewed plating and the whole bit. Now I'm not sure If I have the original or not. If someone would take a look at the pix and let me know if these markings are commonly seen on an original carburetor I would appreciate it.

Many thanks for your time


Tom Krause

EDIT:
I should have looked up the correct number in the Judging guide before starting this thread - see pic #5 it has the correct 7043200 P/N as well as the ET broadcast code. The date code is 3262 or Nov 22nd 1972 - the build date was 11-28-1972

[Joe L.]

Re: 1973 Quadrajet Questions

Hello All,
I have a question regarding some markings on what I thought was the original carburetor for my car. The car has A/C and an automatic transmission. The markings shown in the pictures make me think maybe the carburetor was replaced at some point.
I rebuilt another carburetor as a temporary measure and I was planning to have the original one done by a pro with renewed plating and the whole bit. Now I'm not sure If I have the original or not. If someone would take a look at the pix and let me know if these markings are commonly seen on an original carburetor I would appreciate it.

Many thanks for your time


Tom Krause

Tom------


None of these markings appear like any I would expect to find on an original carburetor. The stamping on the throttle body appears to be a hand stamping done with individual stamping dies. This was rarely, if ever, done at the factory. The 7044500 does look like a Rochester Division part number but I can find no record of it.

Usually, Rochester carburetor part numbers and date codes are found machine stamped on the left rear vertical surface of the float bowl which I cannot see in any of your photos. If the surface is blank, that usually indicates that a SERVICE float bowl was used.

[John S.]

9A390EB4-2FAB-435B-AB9F-F3E3F4CEAFF0.jpg

[Dan A.]

Re: 1973 Quadrajet Questions

Tom,

In your second picture under the 7440500 I see “SER5763”. Does that correspond to your serial number by any chance?

[Jeffrey S.]

Re: 1973 Quadrajet Questions

Aside from the location of the stamping, 7044... would indicate a '74 production date. Your heading says for a '73 so this immediately eliminates this from being the original carb.
Jeff

[Wes S.]

Re: 1973 Quadrajet Questions

My 1973 with original carb, L48 4 speed February car has the attached stamping on carb. There are not engraved numbers any where on body.IMG_3371.jpg

[Tom K.]

Re: 1973 Quadrajet Questions

Hello Joe,

I should have checked the JG first - In the picture I added the P/N, broadcast code and date all seem correct. Just no clue as to the other markings. Maybe it was modified by a performance shop at some point?
I need to decide if I should drop the $$ on this carb or try to find a replacement. Its not like it is ever going to be Top Flight car, but I feel Im just the current care taker and I should do it well.

[Tom K.]

Re: 1973 Quadrajet Questions

Hi John,

I did find the carb does appear to be correct, with the correct P/n broadcast code and julian date. Now I just need to decide whether to try and find another correct replacement or have this one done.

[Tom K.]

Re: 1973 Quadrajet Questions

Hi Dan,

Thats a good thought, and I did look at that after you mentioned it, but the two numbers are not related.

Tom

[Tom K.]

Re: 1973 Quadrajet Questions

Tom------


None of these markings appear like any I would expect to find on an original carburetor. The stamping on the throttle body appears to be a hand stamping done with individual stamping dies. This was rarely, if ever, done at the factory. The 7044500 does look like a Rochester Division part number but I can find no record of it.

Usually, Rochester carburetor part numbers and date codes are found machine stamped on the left rear vertical surface of the float bowl which I cannot see in any of your photos. If the surface is blank, that usually indicates that a SERVICE float bowl was used.

[Tom R.]

Re: 1973 Quadrajet Questions

Tom
I don't see where you mentioned the status of emission control devices and whether they exist, were disconnected or removed. As you debate the carb replacement, rebuild or whatever, keep in mind the original was tuned to a particular emission control strategy. As "rebuilders" deviate from factory, then as well, the carb must be tuned to its current power team reconfiguration.

The point is if you elect to return to a factory-level performance, then those emission control devices must be incorporated to match the carb settings which the original would have been configured for at the factory.

[Dan A.]

Re: 1973 Quadrajet Questions

Tom,

I have a Quadrajet I took off of a 73 454 Corvette with auto trans and A/C about 20 years ago. It is stamped 7043200 ET and below that it has 0333. I sold the car years ago and you are welcome to the whole carb or whatever parts you might need if it will help.

[Joe L.]

Re: 1973 Quadrajet Questions

Hello again Joe,

the plot thickens - I have since found out the base plate is from a 74 truck with a 454. Perhaps this is what was modified on my original carburetor. As I mentioned above I rebuilt another carb for temporary use. As it turns out that was an original from a ‘73 vette with a 350. It was anon-a/c 4-speed car. Can you tell me if the base plate and throttle lever from the 350 would be the same as was used on the 454?

thanks as always


Tom Krause

Tom------


The throttle body ("base plate") assembly includes the shafts and throttle lever. The 350 and 454 throttle body assemblies are different.

[Tom K.]

Re: 1973 Quadrajet Questions

Tom
I don't see where you mentioned the status of emission control devices and whether they exist, were disconnected or removed. As you debate the carb replacement, rebuild or whatever, keep in mind the original was tuned to a particular emission control strategy. As "rebuilders" deviate from factory, then as well, the carb must be tuned to its current power team reconfiguration.

The point is if you elect to return to a factory-level performance, then those emission control devices must be incorporated to match the carb settings which the original would have been configured for at the factory.

Hello Tom,
Thanks for the heads up on this. The PCV system seems functional. I have already replaced most of the hoses as some were collapsed.The AIR pump was removed by the PO, but i do have it. That will be another project for this winter. My thought was that I would put the restored carburetor on along with the AIR pump and lines. With some luck, I will get this accomplished over the winter and the engine will be running well by the spring in it's original configuration.

Tom

EDIT:

Ya know - after I posted my answer I was thinking 'wait a minute what about the EGR Valve'?
I couldn't remember seeing one - so I went to the garage and looked and there aint one!
The PO swapped the valve covers for factory chrome ones and before this I hadnt realized it but the manifold was also swapped for a factory one without an EGR valve. Oh boy - I'm further off than I thought - but this stuff is all part of the charm of owning a Corvette right? right??

Thanks again for all the help from everyone!


Tom Krause

[Tom K.]

Re: 1973 Quadrajet Questions

Tom,

I have a Quadrajet I took off of a 73 454 Corvette with auto trans and A/C about 20 years ago. It is stamped 7043200 ET and below that it has 0333. I sold the car years ago and you are welcome to the whole carb or whatever parts you might need if it will help.

thank you Dan thats a huge help! - I would be glad to buy the carburetor. Im thinking the base plate with throttle lever as well as those brackets that were stamped may be just what I need. If you would send me a PM we can make arrangements.

Tom