Rear Brake Proportioning Valve Under Door - Date Code Question

[camaronut]

Does the rear proportioning valve that is under the drivers door follow the same dating convention as everything else?
In other words, would this valve be dated a month or so prior to the build date?
Wondering, because these valves weren't used on every Camaro produced, therefore they weren't produced in the same quantities as alternators, water pumps, etc.
So it would seem that you could have a valve dated a few months prior to being installed on a car, therefore the question arises?  Is it original to the car?
Maybe they were all blank, then date stamped before installation?

In other words, you'd have an 04A car with a valve dated 072-0.

Possible?  Inquirng minds need to know!!!!

[x66 714]

My original is 154-9, June 3rd. Car was built 8/29/1969 if that helps...Joe

[camaronut]

Interesting - almost 2-1/2 months difference.
Thanks Joe!

BTW, I mean't to say 072-9, not 072-0.  My bad.

[ZLP955]

My LA car is 04A, NCRS production date is April 3, 1969 and proportioning valve is dated 052-9. That's Feb 21.

[169INDY]

My (Z11) LA car is 04C, NCRS production date is April 21, 1969 and proportioning valve is dated 050-9.

[camaronut]

At least we're consistant - but ony three cars / data points.

Anyone else???

[copo]

My car is NOR 06A, GM of Canada shipping date is June 24, 1969 and proportioning valve is dated 155-9.

[uscrichter]

I just checked mine, it's dated 128-9 and the car is 08C

[69Z28-RS]

My 09C Z28 (18 Sept 1969) has the proportioning valve:  KH   R   154 – 9   (3 June)
ie.   3 months prior to auto completion.   

[KurtS]

Most are dated pretty close to the car.
At least 2 of the cars listed were in the extended model year and they were using up old material.

[camaronut]

Most are dated pretty close to the car.
At least 2 of the cars listed were in the extended model year and they were using up old material.

With all due respect, then it's possible that a 06A car could have a 027-9 valve?

[Mike S]

 Here are the following on my 67s
04B LOS- 75-7
05B NOR- 103-7

Mike

[camaronut]

Intersting results. 
Looks like we may have stumbled onto something out of the ordinary in terms of conventional date coding / car build on this particular part.
Hopefully we can get Jerry to chime in.

[67CruiseMaster]

My 09C build 67 Camaro has a date code 229-6. August 17th of 1966.

[camaronut]

Then is it possible that a 06A car could have a 027-9 valve?  Being such a late build car?
Thanks

[KurtS]

With all due respect, then it's possible that a 06A car could have a 027-9 valve?

Possible?? Yes. Very unlikely.

Looks like we may have stumbled onto something out of the ordinary in terms of conventional date coding / car build on this particular part.

The dating is typical and predictable.
I have 120+ datapoints. Looks like the incoming batches were large (small part, easy to store), so the usage stretched over longer time periods.

[LVN 67]

The valve on my NOR 02E 67 is stamped 10-7

[R68GTO]

My 09D of 1969 has a 155 dated valve.

[Hans L]

My LA car is 04A, NCRS production date is April 3, 1969 and proportioning valve is dated 052-9. That's Feb 21.

My VN Car, 04B (also Cortez Silver) has the exact same date code for the proportioning valve - 052-9.   

[ric1969]

  My LA car is 02B , proportioning valve is dated 016-9

[bobs69z]

My 06A NOR 6/26 build has a 155-9 (June 4).  Same as motor.

[RonM]

Hi guys, my 07D of 68 has a date of 157-8. Hope this helps, RonM.

[Maxsg1973]

 07E, NCRS production date is August 3, 1968 and proportioning valve is dated 157-8.

[mccorry]

My 10A LA built car has a date code of 157-8 (June 5th, 1968).

[mgreenz]

Our 1968 04D LOS car has PR valve dated 85-8. March 25th.