Gas tank date codes

[ric1969]

 My LOS 69 01B has 21 69 and the tank sender locking ring has 15 9 with 3/8 pipe

[1967butternut]

Couldn't edit my previous post, gave up trying to upload photos here so put them in my photo gallery here.
https://linkpro.net/piwigo/index.php/category/20

My LOS 67 has the tank stamp.

5 D 7 (the D is reversed)

And a fairly complete  blue stamp or stencil that reads:

 12 19
51865
MADE IN (I'm assuming USA got lost over the side.)

[KurtS]

Here's the current compilation.
67 has a calendar week code. 16 D 7 would be the 16th week of 67, day shift. 40 6N would be 40th week of 66, night shift.
The format changed in 68 and 69 to have the week counted from the beginning of the *model* year. The extended 69 model year used tanks dated for the 70 model year.
LOS and NOR data is intermixed and shows the same pattern.

67:
11A  42 6D  (stamped 42 9D)
11A  40 6N
??    52 N 6
01B  52 N 6
02A   5 N 7
02B   5 D 7
02C   5 D 7
02E   6 D 7  (stamped 7D6)
03B   9 D 7
03C 11 N 7
03C 11 N 7
04B   4 N 7
04D   5 D
05A  17 D 7
05C  16 D 7

68:
10A  67 42
10E  7 5 N  (7 may be a 2 and 5 is upside down)
11B  68 15
11C  68 17
11D  68 19
12D  68 20
01C  68 19
02C  68 27
02D  68 32
02E  68 30
02E  68 32
03C  68 34
03D  68 36
04A  68 37
04D  68 41
05C  68 42
05C  68 42
05C  68 43
05D  68 44
05E  68 46
06A  68 45
06B  68 47
07C  68 52
07D  68 52
07D  68 53

69:
09B   1 69
09B   1 69
09D   5 69
10A  05 69
10A   6 69
10C   4 69
10D  10 69
10D  10 69
10D  10 69
11A  12 69
11C  11 69
11D  14 69
11D  15 69  (stamped 69 51)
11D  16 69
11D  17 69
12A  16 69
12B  17 69
12B  17 69
12C  16 69
12C  16 69
12D  19 69
01A  19 69
01B  21 69
01B  21 69
01B  21 69
01C  21 69
01C  22 69
02A  25 69  (upside down 5)
02A  25 69  (upside down 5)
02A  25 69  (upside down 5)
02B  25 69  (upside down 5)
02C  26 69
02D  28 69
02D  28 69
02D  29 69
02D  29 69
02D  29 69
02D  29 69
03B  29 69
03B  29 69
03D  28 69
03D  45 69 - replaced?
03D  33 69
03D  33 69
03E  33 69
03E  33 69
04A  33 69
04B  33 69
04C  33 69
04C  37 69
04C  37 69
04C  37 69
04C  37 69
04C  37 69
05A  37 69
05E  41 69
06A  41 69
06A  42 69
06A  45 69
06A  45 69
07A  48 69
08A   1 70
08A   1 70
08C  48 69
08C   2 70
08C   2 70
08D   2 70
09A   5 70
09C   5 70
09D   5 70
10A   9 70
10C   9 70
10D  10 70
10E  10 70
10E  12 70

Thanks!

[ric1969]

My Los 02B is 25 69 and 5 is upside down

[GCS SS350]

1969 SS350
Build Date on Cowl : 12B
Tank : 18  69 = Jan. 8 1969?

[GCS SS350]

Question. if build date on cowl is 12B which is 2nd week December (Late 1968)and tank date is 18 69 which now I think stands for 18th week of model yr 1969.
Car was purchased new Jan 23, 1969. How can tank possibly be an orignal? I see on data on tanks real close to mine on dates. Am I messed up on reading my numbers or has tank been changed? 

[KurtS]

Question. if build date on cowl is 12B which is 2nd week December (Late 1968)and tank date is 18 69 which now I think stands for 18th week of model yr 1969.
Car was purchased new Jan 23, 1969. How can tank possibly be an orignal?

Your car: 12B  18 69
2 other 12B datapoints:
12B  17 69
12B  17 69

[GCS SS350]

Thanks Kurt for the reply. I saw those numbers and figured my tank was right in that area. What I'm not understanding is how the tank is dated and how it applies to the production date. I've looked around find nothing that is making cense to me. The 18 69 tank date would have to have traveled back in time to be installed in 2nd week of December 1968. I know thats not correct. Close as I can find in description was that it would be 18th week of production year 1969. If guessing right I found reference of middle Aug, Sept as start of production so 18 weeks is 41/2 months which puts it in December if I go with middle August as 1969 production start. Then it would make cense. Any chance thats correct? Rookie on some of these things.

[69Z28-RS]

69 Gas tank production possibly began *earlier* than mid August?   do a little more research...?

12B was the 'projected build week' at the time the order was made; they didn't always come out perfect, so figure out the actual production date of your car (which can be estimated pretty closely from the VIN number).

[ZLP955]

Only speculation, but look at the dates in Kurt’s latest data summary for the likely cut-off point for the traditional model year when 69 production was extended:
07A 49 69
08A  1 70
Hints at resetting the MY week number at the beginning of August.
Based on that approximation, tank dates of week 17-18 fit in well with 12B December projected assembly, granted that the Fisher calendar does not necessarily align with annual calendar months.

[BULLITT65]

My early 69Z 10B L.A. car, gas tank is dated 4 69

[KurtS]

What I'm not understanding is how the tank is dated and how it applies to the production date.

You are confusing model year and calendar year. http://www.camaros.org/geninfo.shtml#modelyear

[GCS SS350]

OK, back again. Trying again to see if I've figured it out yet.
12B = 2nd week December
Vin date chart on CRG is 9N551862 = November and 9N569987 = December
If those Vins are begining numbers for November and December than my Vin falls into roughly 3rd week November
My Vin 9N561885
Tank date is 18  69 which = 41/2 months from what I believe production model starting about August 1968
Then if my calculations are correct Aug, Sept, Oct, Nov, 1/2 Dec  would fall roughly into my 12B build date
Looks good to me! Am I getting close to having this figured out? Thanks guys for trying to push me in right direction. Still a little slow but hope I've figured it out.

[69Z28-RS]

The numbers shown are END OF MONTH numbers, so you are off a month.   Your car was most likely built 2nd of 3rd week of December...

[GCS SS350]

If all my numbers are right but go backwards on the 9N569987 to 9N561885 is approxamately 2 weeks. So then about end 2nd or begining 3rd week December? That then puts it right on cowl production date of 12B. Then if my calculations of 18  69 which is 41/2 weeks comes out to Aug, Sept, Oct, Nov, 1/2 Dec  would fall roughly into my 12B build date. Don't know if I did my calculations right but looks like begining of 3rd week on vin? Now that I'm starting to slightly figure it out with everyones help it starts to make cense. Thanks all for excercising my brain.