Gas tank date codes

[x1169]

Hello all, new to this site. Great info. I think I have a tank not submitted yet, AND not listed in the compilation. I have a 10A LOS 68 L35/M40 car with a tank date code of 67 42. In addition, after cleaning it, I've discovered production marks on the right top side of a handwritten "5" over "6". If this is a duplicate, sorry. I may have missed it in reading the the 16 pages...….Thanks again, GREAT SITE!

[KurtS]

Here's the latest and greatest 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
02A   5 N 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
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
01C  21 69
01C  22 69
02A  25 69  (upside down 5)
02A  25 69  (upside down 5)
02A  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  12 70

Thanks!

[67CruiseMaster]

My 01B convertible tank code is 52N6.

[x66 714]

My 01B convertible tank code is 52N6.

1967 I'm guessing?...Joe

[67CruiseMaster]

Oops, yes my 67 convertible 01B tank code is 52 N6.


Scot

[sabino56]

I have 68 base model L37.  06A    68 45.  Fits in the gap in table

[Edgemontvillage]

25 69 (with upside down "5") 2B Norwood 1969 RS Z/28

[Daytona Z]

Here's the original in my late 10E built 69 Z. Tank is dated 10 / 70

[cruizin69]

25 69 (with upside down "5") 2B Norwood 1969 RS Z/28

My 02A car is 25 69 also .
The 25 is upside down also.

[cook_dw]

Unknown date but thought the screen printing was interesting.

[R68GTO]

Would love to see the rest of that stencil

[69Z28-RS]

In the past when we've seen such stencil markings on sheet metal, it's been stencil markings identifying the sheet metal going into the stamping plant..  ie.  in this case, if that's what it is/was, it would be the raw sheet metal marking on metal going into the gas tank manufacturer...  ie.  it's not a marking applied by GM...

[cook_dw]

Yes Gary that is why I posted the photo.  I never said it was applied by GM.  It's as you stated a manufacturer mark.  I would have thought it was obvious being that as it is more common on 2nd gen tanks.  Just not seen as often on 1st gens.

[ZLP955]

Maybe this should be a separate research topic, but I'll add it here for now as it's related to fuel tanks:
I mentioned previously in this thread that I pulled a tank dated '21 69' from an 01B LA car. I checked that tank out recently in connection with Lloyd's thread on tape style used on the fuel sender line; noted at the tank sender locking ring that the sender is also dated with '16 9'. Thought that a 5-week gap between sender and tank was high, based on the demand rate of 1-for-1 at the factory.
Wondered if anyone else had noted similar gaps between those items?

[1967butternut]

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.)

I have pictures but can't make them small enough on the phone.