Topic: 67 SJ Coupe - 36k unrestored

[Cobra5678]

Starting to clean up a 36k unrestored coupe with original paint, original vinyl top, original interior
Beginning to clean engine compartment and find a tag on the 4100 carb that puzzles me.
Top line - DOPF AG
Second line - AO-25
Is this a dealer replacement carb?

Carb still has plastic mixture screw covers and looks very original.

Any help is appreciated.

[Bob Gaines]

Starting to clean up a 36k unrestored coupe with original paint, original vinyl top, original interior
Beginning to clean engine compartment and find a tag on the 4100 carb that puzzles me.
Top line - DOPF AG
Second line - AO-25
Is this a dealer replacement carb?

Carb still has plastic mixture screw covers and looks very original.

Any help is appreciated.

It is a a replacement carb. Regardless of auto parts store of Ford dealer it is still a 1970 -73 replacement . The D0PF AG carb is a 4300 not a 4100 carb series.

[ruppstang]

+1 with Bob. The 4300s were problematic, many were replaced. When I see a add for one that says it was taken off when it was only a year or two old and has been on the shelf since then I think good luck getting that one to run correctly. They gave up on it back then.

I would love to see pictures of this car. Please post some in the unrestored section.

[Cobra5678]

It is a a replacement carb. Regardless of auto parts store of Ford dealer it is still a 1970 -73 replacement . The D0PF AG carb is a 4300 not a 4100 carb series.

Thanks for response. Engine has thermactor system and a/c intact. Normal repairs after sitting - water pump, fuel pump, radiator, starter and alternator.  I have gathered all the correct parts except fuel pump to return to as born.  Guess i have to add the carb to my list.  Bummer?

[Bob Gaines]

Thanks for response. Engine has thermactor system and a/c intact. Normal repairs after sitting - water pump, fuel pump, radiator, starter and alternator.  I have gathered all the correct parts except fuel pump to return to as born.  Guess i have to add the carb to my list.  Bummer?

The people and information on this website can be helpful. I only mention this because you say you are concerned about originality of your car. I hope you saved the original parts after your repairs. Although not as cheap as replacement auto parts store bought parts they can all be rebuilt. The water pump has a specific casting number and I can be rebuilt. The fuel pump has a important distinct style look not found in modern generic replacements. Only one guy does original fuel pump rebuilds that I know of. Radiator can be rebuilt with a new core because it is a specific style and looks different then typical replacements. I have a guy that rebuilds my alternators to my specifications with proper case etc. Alternator front and back case will vary dramatically from auto parts stores generic new or rebuilds. Same guy rebuilds my starters and then I add the assembly line details.With a little knowledge of what is original and the proper persuasion most of these things can be rebuilt with a local rebuilder. If you can't find a rebuilder or don't want to go to the trouble your welcome to reach out to me for the things I can provide. Besides that this website with all of its knowledge is at your disposal to help fill in the blanks.  It will be up to you to decide what makes the most sense for you and your car. You do have alternatives.

[Cobra5678]

The people and information on this website can be helpful. I only mention this because you say you are concerned about originality of your car. I hope you saved the original parts after your repairs. Although not as cheap as replacement auto parts store bought parts they can all be rebuilt. The water pump has a specific casting number and I can be rebuilt. The fuel pump has a important distinct style look not found in modern generic replacements. Only one guy does original fuel pump rebuilds that I know of. Radiator can be rebuilt with a new core because it is a specific style and looks different then typical replacements. I have a guy that rebuilds my alternators to my specifications with proper case etc. Alternator front and back case will vary dramatically from auto parts stores generic new or rebuilds. Same guy rebuilds my starters and then I add the assembly line details.With a little knowledge of what is original and the proper persuasion most of these things can be rebuilt with a local rebuilder. If you can't find a rebuilder or don't want to go to the trouble your welcome to reach out to me for the things I can provide. Besides that this website with all of its knowledge is at your disposal to help fill in the blanks.  It will be up to you to decide what makes the most sense for you and your car. You do have alternatives.

I was not clear on my response, sorry.  The car is running currently and the PO replaced parts with aftermarket auto parts store stuff.  Car had the original correct radiator and water pump in the trunk which I have had rebuilt.  I had a patina correct alternator rebuilt and ready to install from another project.  Still need a few items that I have not sourced, fuel pump and starter come to mind and now I have to add a carb.  I have a correct 4100 from a car that I have had for 45 years but not sure if I want to put it on this car versus sourcing a replacement.  Just starting the analysis and clean up of the engine compartment so likey will find more surprises and my list will get longer.  Thanks for offer for a reach out.  I met you at SAAC 38 when you judged my 67 GT350 survivor.  Thanks for your support.

[Bob Gaines]

I was not clear on my response, sorry.  The car is running currently and the PO replaced parts with aftermarket auto parts store stuff.  Car had the original correct radiator and water pump in the trunk which I have had rebuilt.  I had a patina correct alternator rebuilt and ready to install from another project.  Still need a few items that I have not sourced, fuel pump and starter come to mind and now I have to add a carb.  I have a correct 4100 from a car that I have had for 45 years but not sure if I want to put it on this car versus sourcing a replacement.  Just starting the analysis and clean up of the engine compartment so likey will find more surprises and my list will get longer.  Thanks for offer for a reach out.  I met you at SAAC 38 when you judged my 67 GT350 survivor.  Thanks for your support.

Good to hear about the parts . Best of luck with the project.

[J_Speegle]

I was not clear on my response, sorry.  The car is running currently and the PO replaced parts with aftermarket auto parts store stuff.  Car had the original correct radiator and water pump in the trunk which I have had rebuilt.  I had a patina correct alternator rebuilt and ready to install from another project.  Still need a few items that I have not sourced, fuel pump and starter come to mind and now I have to add a carb. I have a correct 4100 from a car that I have had for 45 years but not sure if I want to put it on this car versus sourcing a replacement.  Just starting the analysis and clean up of the engine compartment so likely will find more surprises and my list will get longer.  Thanks for offer for a reach out.  I met you at SAAC 38 when you judged my 67 GT350 survivor.  Thanks for your support.

Guessing that you have an A code 67 and not a C code.

The 4100 would not be the original carb. If you shared the stamping or ID tag info we can help determine where that one might have come from.  Below is what an Autolie 4300 looks like.   DOPF's were standard replacements/service parts starting in 1969-70 and they (like assembly line carbs) would have had the plastic limiter caps included uninstalled in the box with the carb and other parts needed for installation like the one shown below



Just as a note we may move this thread to the Member Restorations/Builds section just to keep things neat. We'll see where the thread leads us 

[Cobra5678]

Guessing that you have an A code 67 and not a C code.

The 4100 would not be the original carb. If you shared the stamping or ID tag info we can help determine where that one might have come from.  Below is what an Autolie 4300 looks like.   DOPF's were standard replacements/service parts starting in 1969-70 and they (like assembly line carbs) would have had the plastic limiter caps included uninstalled in the box with the carb and other parts needed for installation like the one shown below



Just as a note we may move this thread to the Member Restorations/Builds section just to keep things neat. We'll see where the thread leads us 

Carb and tag pic as confirmation

[Cobra5678]

Need to figure out pic sizing?.
Tag pic

[Bob Gaines]

If by inquiring about tag letter size because you are contemplating keeping the carb and changing out tag you should check with Marti Autoworks    https://www.martiauto.com/tags.cfm  . They make up carb tags . Regardlees there is a Tag alternative.

[J_Speegle]

Need to figure out pic sizing?.
Tag pic

The tag and the writing on it could differ from factory on service parts such as you have

[Cobra5678]

As I have done more research, I believe my 67 a-code was born with a 4300 carb.  SJ car with TE built in June.  I agree the tag is incorrect but thinking the 4300 on the car is likely a service replacement.  The fuel pump to fuel filter gas line appears 100% original and correct.
Since the car will be restored as survivor it feels like the incorrect tag is just part of the cars history as it?s likely a service replacement. 
Am I on track?

[J_Speegle]

As I have done more research, I believe my 67 a-code was born with a 4300 carb.  SJ car with TE built in June.  I agree the tag is incorrect but thinking the 4300 on the car is likely a service replacement.  The fuel pump to fuel filter gas line appears 100% original and correct.
Since the car will be restored as survivor it feels like the incorrect tag is just part of the cars history as it?s likely a service replacement. 
Am I on track?

Thought this info was in another thread but could only find non-Thermactor related threads

67 Mustang 4100 Autolite With Thermactor and manual transmission - C7DF-C

67 Mustang 4100 Autolite With Thermactor and automatic transmission -C7DF-D


Don't have a close up of the base of a 1967 4300 but here is an example from a 69 version. Have some NOS C8's out in the garage but these pictures were handier   

Notice that the tag on the carburetor is made of bras instead of the regular material. This identifies it as a Thermactor 4300 during  1967 production

[Bob Gaines]

As I have done more research, I believe my 67 a-code was born with a 4300 carb.  SJ car with TE built in June.  I agree the tag is incorrect but thinking the 4300 on the car is likely a service replacement.  The fuel pump to fuel filter gas line appears 100% original and correct.
Since the car will be restored as survivor it feels like the incorrect tag is just part of the cars history as it?s likely a service replacement. 
Am I on track?

The service replacement carb and tag my be part of the cars history however the survivor aspect has to do with the condition of the car and original parts. Replacement parts that end up on the car are possible deductions. At least as it has to do with the concours venues in the survivor class's.