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I was doing a brake job on my 69 and noticed these chalk marks under the fender. Do you guys think they are from the assembly line for some reason or what do you guys think they are ?
That’s really neat. The one on the right looks like the number ‘5’ lying on its side. There are markings found on the underside of many C3s’. But I don’t know about the fenders.
Probable the most knowledgeable response will be from an NCRS researcher?
They may correspond to the job number, which repeated every 500 cars. It should match the last 5 digits of your VIN, or be off by 500. If that says 005, the last three of your VIN are likely to be 005, or 505.
They may correspond to the job number, which repeated every 500 cars. It should match the last 5 digits of your VIN, or be off by 500. If that says 005, the last three of your VIN are likely to be 005, or 505.
Maybe.
That is NOT completely correct (at least for 69s). The job number on the tank sticker will correspond to the vin or be off by 500 but the hand written job numbers found on the inner body panels will not correspond to anything on the paperwork or the vin. You would think they would just use the same number but for some reason they didn’t in 1969. The poster above says his match’s but it might be a 70 or 71? However, you are correct that the hand written body number does start over after 500. The only time I have seen them correspond on a 1969 is on a car that has been restored and I’m sure that car had completely fake paperwork so I think that match was manufactured after the fact.
For example on my two 69s, one vin ends 6665 but the written job number is 236. The other vin ends 2871 and the written job number is 400.
Also, you will find the numbers all over the place. On my “400” car it’s in the drivers side fender, under the rear deck above the gas tank, under the passenger side heat shield in the engine compartment and under the carpet behind the passenger seat.
Take pictures of everything. Those marking are nice to keep for the history of the car. Looks like 005?
Last edited by ed427vette; Jul 28, 2021 at 10:46 AM.
That is NOT completely correct (at least for 69s). The job number on the tank sticker will correspond to the vin or be off by 500 but the hand written job numbers found on the inner body panels will not correspond to anything on the paperwork or the vin. You would think they would just use the same number but for some reason they didn’t in 1969. The poster above says his match’s but it might be a 70 or 71? However, you are correct that the hand written body number does start over after 500. The only time I have seen them correspond on a 1969 is on a car that has been restored and I’m sure that car had completely fake paperwork so I think that match was manufactured after the fact.
For example on my two 69s, one vin ends 6665 but the written job number is 236. The other vin ends 2871 and the written job number is 400.
Also, you will find the numbers all over the place. On my “400” car it’s in the drivers side fender, under the rear deck above the gas tank, under the passenger side heat shield in the engine compartment and under the carpet behind the passenger seat.
Take pictures of everything. Those marking are nice to keep for the history of the car. Looks like 005?
I’m not sure what they are. I’m about 89 percent sure that this car has 68k original miles on it. I have One the past 3 owners never drove the car more than 2k miles. And it was stored. Most of its life. So all the odd little details during assembly are probably still intact.
Those numbers meant something to the assembly line workers. There were standard conventions; then there were non-standard conventions used by some. Whatever told the line workers what the build required was what was needed.
Also, you will find the numbers all over the place. On my “400” car it’s in the drivers side fender, under the rear deck above the gas tank, under the passenger side heat shield in the engine compartment and under the carpet behind the passenger seat.
Take pictures of everything. Those marking are nice to keep for the history of the car. Looks like 005?
The passenger-side underbody panel is a consistent location for the job number, especially after 1973 when the GMAD manifest (landscape style) buildsheet was introduced. At this point, the buildsheet documents the three-digit job number, hand scratched with grease pencil. Not sure before 73, but the underbody panel has a shield that provided some protection against the elements and road debris deteriorating the job number in that location.
Chalk marks under fender.
