where is the carb date on a 68 427 l36 carb with the model number 7028209 be? should it be right below the number 7028209 on the body OR on the base plate?

also could it have a 3 digit date code i know most have 4 digit ones right? i found a 7028209 for a 68 l36 with 728 on the base plate

thanks

 

The date code will be on the base plate for the '68 carb. 7028209 is the correct carb for a '68 427/390 with a 4 spd--a rather rare carb. The last digit in the date code is the year, 68 in your case. The first two or three digits is the day of the year as on the Julian calender. In your case 72 is the 72nd day of the year or approximately mid-March '68.

 

thanks i was just confused because going by my ncrs manual it talked like the date code was supposed to be 4 digits so thanks.

let me ask you this would that carb match up with my car, on the door jam my car has the i guess you call it build date of D07 I think cars back then started in august prior to the year they were so build for 68's started in august 67 right? A for august and mine is a D07 so would the D07 be Nov. 67? and if so would that 728 dated carb work along with it?

if i can atleast get a good understanding on why it uses a 3 digit date etc. and if it's anywhere near matching up with my 68

here is the carb guy wants 200 for it

 

RPO, I almost bought that carb awhile back from him. Why I didn't is the 728 is kinda weird if you look in a ncrs judging manual it says rochester carbs have a 4 digit julian date so if that is 728 it should actually read 0728 but for some reason it doesn't it just has like the picture shows 3 digits.

this is straight from my ncrs book.

"the date code is stamped on the driver's side edge of the base plate near the rear".

which it is but it goes on to say this...

"on quadrajet carbureators produced by Rochester, FOUR numerals will be next to the part number. The first three numbers are the julian day of the year for the unit production. Januaray 1 begins as 001 and the year is the numbered to 365 except for the learp year, which goes to 366. The last numbe4r is the last digit of the year production."

so up to you if you buy it might be fine but that didn't add up to the way the carb is dated to me it seems to say that carb should have a date code under the 7028209 thats 4 digits which it doesn't and the date on the base plate is only 3 digits, I figured it was off of something besides a vette but still the same core maybe...who knows

and your question about will that 728 dated carb match your D07 nov. 67 build 68 car I'm not sure how long the range is between dates from the carb to the car that is accepted and considered original to the car.........I want to say it's 6 weeks or 6 months I think it's 6 something

 

i have a 7042202 here for a rebuild and the number stamped on the base is "116" the carb i have is "built by carter" for rochester so the carter built carbs may be dated differently

 

Maybe I'm missing something here, (I'm tired) but if your car was built in Nov. of '67, a baseplate that is dated ending in 8 (1968) is a little on the late side. I have a Q-jet for a '68 smallblock that is dated 3387, (338th day of 1967) and that would even be too late for your car. If you are looking for the right numbers, you at least have to be looking for one ending with a 7.

Rich

 

this is the info I am after I need to know from someone who is a NCRS guru. If a D07 ( in the door jam) dated car which stands for nov. 67 if a 728 dated carb would be correctly dated within the build of my car.

wildman says he thinks the carb can either be dated 6 weeks before/after the cars build date or 6 months before/after the cars build/door jam date.. this is the info I need to know. I need to know how long before/after the build of the car the carb can be dated and considered correct to the car.

also does it matter if the carb is dated with a 3 digit date code? that means it was built by carter (but it's still a rochester carb), should I look for one with a 4 digit date code?

ncrs books don't cover this good at all

thanks everyone

 

The carb will get full judging credit for the date up to six months prior to the car's final assembly date; that's the NCRS standard for dated components (except glass - up to a year is allowed there).

 

john what is the NCRS story on 3 digits vs 4 digits and carter built vs rochester built as far as the date codes go???

 

I would like to know this too!

and if it can only be 6 months prior, considering this carb is built a few months after my cars build date it won't work, if it could be up to 6 months after the cars build date it would though.

john one more thing my cars "final assembley date" is the D07 i see in my drivers side door jam correct? just want to make sure I am comparing the carb date to the right date I found on my car

 

Yup, D07 on a '68 is November 7th; the door trim tag was installed when it left the Paint Shop, so it most likely came off the line on the 8th.