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Gents, for numbers and history lovers...
i'm reaching out for for some help..
my 71 lt1 trim tag shows A17 (Aug 17 1970) which make sense with the early production 100214 serial number on the vin since the 71 production started in August 1970.
The engine stamp shows 9th of August (V0809CGZ). Make sense. Here is the issue. The carburetor is the correct one (part 3989021, list 4801, 6808, 4519) BUT the 3 digit date is 122 which i believe stands for second week of Feb 1971, 6 month after the assembling. Was it replaced with a correct one that soon after the car was made? sounds odd.
the GM strike was right in between the assembly date and the carburetor date. I wonder if the car was sitting waiting to be completed (without carburetor...) till the end of the strike and that's could be the reason of the 5/6 months gaps between the car and the carburetor dates?
Thats the story I would tell if it matters to someone else about your cars numbers....
i would love to understand what happened for myself only...you don't think it is plausible right? i agree, it s a push but also swapping a carb 5 month after the assembly of the car sounds odd.
i don t care about the value of it, it still is a correct carb for what it matters
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you will have to go back and look at the strike and see what the dates actually were. Im sure there is a history channel story or a wiki page you could string together and find the truth...You could also take your vin...go to the C3registry, find a car as close to yours above and below your vin and write to them and ask if they have the numbers matching carb and get the numbers off of it...its a lot of work but if you gots to know!!!
The GM strike was from September 14, 1970, to November 21st. The last pre-strike car was #2226. Unfortunately, your theory has no plausibility. It’s much more likely that a warranty carburetor was replaced on your car reasonably early in 1971 calendar year.
OK here is my take.
I had an original 70 LT-1 for 27 years, with the original carb, I raced it, and that carb gave me fits. I had to send it back to Holley for them to fix.
This is what caught my eye on your carb:
That looks like a brass plug to me.
I would like you to tap on it to determine if it is metal or putty.
A factory production line carb would have putty there.
A CE carb is not drilled there.
Yours may not match either scenario.
I would like to see the air bleed.
Then take a pic straight down into that choke showing both that "plug" and it's adjoining air bleed, like this: This is a CE carb, not OEM, and has a normal non drilled housing and a normal brass air bleed at that spot.
Take a photo of the carburetor’s choke pull off vacuum canister on the passenger side.
That can be a real quick indicator whether the carb has been played with or replaced.
Regards,
Stan Falenski
Stan
Early 1971 4801 were just 4801 with no dash? Then some modifications from Holley were made then became 4801-1. Have also seen 4801-1A on over the counter service.
OK here is my take.
I had an original 70 LT-1 for 27 years, with the original carb, I raced it, and that carb gave me fits. I had to send it back to Holley for them to fix.
This is what caught my eye on your carb:
That looks like a brass plug to me.
I would like you to tap on it to determine if it is metal or putty.
A factory production line carb would have putty there.
A CE carb is not drilled there.
Yours may not match either scenario.
I would like to see the air bleed.
Then take a pic straight down into that choke showing both that "plug" and it's adjoining air bleed, like this: This is a CE carb, not OEM, and has a normal non drilled housing and a normal brass air bleed at that spot.
that s why i love group like this and really appreciate people like you. I ll have a look thanks a lot!!!
Early 1971 4801 were just 4801 with no dash? Then some modifications from Holley were made then became 4801-1. Have also seen 4801-1A on over the counter service.
Paul,
Absolutely correct. I wouldn't expect a "-1A" to be anything but a service carburetor. A "-1" might still be an original carburetor, but then again, could be a service carburetor as well.
Absolutely correct. I wouldn't expect a "-1A" to be anything but a service carburetor. A "-1" might still be an original carburetor, but then again, could be a service carburetor as well.
Absolutely correct. I wouldn't expect a "-1A" to be anything but a service carburetor. A "-1" might still be an original carburetor, but then again, could be a service carburetor as well.
A carburetor used as a service replacement for an original, production line carburetor. The service carburetor date will be after the assembly date of the engine.
[QUOTE=cristianstarv;1606694823]Gents, for numbers and history lovers...
i'm reaching out for for some help..
my 71 lt1 trim tag shows A17 (Aug 17 1970) which make sense with the early production 100214 serial number on the vin since the 71 production started in August 1970.
The engine stamp shows 9th of August (V0809CGZ). Make sense. Here is the issue. The carburetor is the correct one (part 3989021, list 4801, 6808, 4519) BUT the 3 digit date is 122 which i believe stands for second week of Feb 1971, 6 month after the assembling. Was it replaced with a correct one that soon after the car was made? sounds odd.
the GM strike was right in between the assembly date and the carburetor date. I wonder if the car was sitting waiting to be completed (without carburetor...) till the end of the strike and that's could be the reason of the 5/6 months gaps between the car and the carburetor dates?
Hello Christian
I recall replying to your question on the NCRS forum
My car is #150
I have 074 dated carb
August 10 is engine build date
August 17 is trim tag
You can use an 074 carb or if you can't find one then use a 081 would be the latest
I am also inquiring if the August 70 built LT1 for the 71 model year. Would the pin strips on the hood be the thicker ones or the new thin ones to reflect new year car.
However I have 1970 installed no lower front screws signal assemblies. My car was repainted 4 th month of ownership from Red to Ontario orange as new owner didn't like red so I don't know what would be the original pin stripping used at the factory
Anyone can help??
I am also inquiring if the August 70 built LT1 for the 71 model year. Would the pin strips on the hood be the thicker ones or the new thin ones to reflect new year car.
Anyone can help??
Funny you should bring this up.
When I was NCRS 1970-1972 Team Leader, I was approached by a man by the name of Ed Campbell. Ed had what appeared to be an original paint 1971 with a serial number in the 1200-1300 range. Car definitely had the 1970 style, dual width stripes. I’m certain that the different stripe thicknesses were being used interchangeably from the end of 1970 through the beginning of 1971… I know of several 1970 LT-1s with equal width stripes (my own included) and I’m sure that Ed’s car wasn’t the only 1971 with different width stripes… Would love to hear about others.
A carburetor used as a service replacement for an original, production line carburetor. The service carburetor date will be after the assembly date of the engine.
Regards,
Stan Falenski
thanks Stan, so that would be still made by GM and the date (feb 1971) is when they made it?
thanks Stan, so that would be still made by GM and the date (feb 1971) is when they made it?
Well, it was made by Holley, but yes, after your car was built . It would be considered a service replacement at that point. WHY it was replaced is the big question.
That’s not to say that this carb could have been used originally on another car… We just don’t know. What we DO know is that it is too late to have been installed on your car originally.
Please take a pic of the idle air bleeds inside the choke horn. My info says only the OEM factory installed carbs have adjustable idle air bleeds and the over the counter ones do not. They were for emissions tuning. There is a tiny screw under that plug, and no brass insert in the idle air bleed, it's just wide open, if it has the screws. My date correct 1970 definately had them. One of them vibrated closed and the carb would barely run. But mine were sealed with putty.
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lt1 carburetor
