Cut off date for Chambered Exhaust

[mockingbird812]

Does anyone have documentation or knowledge of when the c. exhaust could be ordered on a Camaro or Chevelle?

Thanks!

[bbbenny]

I know that the cutoff date, from a factory issued memo was may 19 th. 1969.BBBenny

[mockingbird812]

Thanks Benny. I had thot it was earlier in the year. Good info.

Thanks!

[DZ Fool]

Was it ever standard on early 69Z/28 's ( nov 68 )

[396L35]

[ QUOTE ]
Was it ever standard on early 69Z/28 's ( nov 68 )

[/ QUOTE ]
I dont know if it was standard on the early Z/28's but it was an option... I thought the cut off date was in April 69??? But this doesn't say that you couldn't get it over the counter at the parts dept.... Mark

[Mr70]

This should help.
From Technical Service Bulletin 69-T-8 dated April 15th,1969.
----------
"The sections of this bulletin that apply to Camaros with RPO Z/28 are being revised to include a letter design exhaust system.

Many of the early production 1969 Super Sport Chevelle and Camaro models were equipped with a chambered exhaust system.There are some local and State police Departments issuing warnings and citations to the owners of these vehicles for what they term "excessive noise".
Consequently,and effective in production on November 25th,1968,the Chambered exhaust system was discontinued as the standard exhaust system on Camaros w/options Z/28,L-34 and L-78,and also on Chevelles with options L-34,L-78 & L-89.
Since that time,the standard exhaust system on these vehicles has been the regular muffler dual exhaust as used w/RPO L-35,(325HP),except for the Camaro Z/28.This used the same regular muffler dual exhaust as option L-48,(300HP).
The chambered exhaust system is still available as optional equipment known as RPO NC8 in those area where this system is permissible.
The latest design system for Camaros with RPO Z/28 option includes resonators ahead of a modified deep tone muffler to further reduce the noise level.This system will be effective in production approximately April 15,1969.
On the basis of a customer request,Camaros w/RPO Z/28 option with the early built chambered,or the interim built regular muffler dual system,should be converted to the latest exhaust system w/resonators.The remaining options that used a chambered system should be converted to a regular muffler dual exhaust system.The parts required for conversion are listed on the following pages of this bulletin."
----------
It then goes on to show diagrams and part numbers to make these conversions at all Chevrolet dealerships on vehicles previously mentioned.

[mockingbird812]

Nice stuff Rick. Curious how they mention the applicability to "Z/28, L-34 and L-78" wrt Camaros and "L-34, L-78 & L-89" for Chevelles. Wonder why no reference to L-89 for Camaros?

Do you have the bulletin that Benny was referring to which does away with the NC8 option?

[Donnie]

(Do you have the bulletin that Benny was referring to which does away with the NC8 option?)

I do. I will snap a pic and send it to Bruce.

[mockingbird812]

Thanks Donnie!

[Donnie]

heck, I can just send it to you Sam.