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Author Topic: Exhaust  (Read 2871 times)
DyRally-Z1986
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« on: August 15, 2013, 12:58:38 PM »

Can you guys tell me if an O1C build date Z/28 would of came factory with Chambered Exhaust? Thanks!
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Ed Bertrand
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« Reply #1 on: August 15, 2013, 01:36:09 PM »

RPO NC8 was standard on the 1969 Z28 until November 25th, 1968. After that it became optional, and then discontinued on May 19th, 1969.

Ed
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DyRally-Z1986
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« Reply #2 on: August 15, 2013, 02:10:29 PM »

So it being a January 69 car means it's optional?
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Ed Bertrand
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« Reply #3 on: August 15, 2013, 02:17:39 PM »

Correct.

Ed
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DyRally-Z1986
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« Reply #4 on: August 15, 2013, 02:50:55 PM »

Thanks again!
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69Z28-RS
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« Reply #5 on: August 15, 2013, 03:53:41 PM »

For late '69 Camaros, after discontinuation of the NC8 (chambered), and after the introduction of the resonators to the standard transverse muffler system, What was the diameter of the exhaust (head) pipe off of the manifolds??    People who sale these, list both 2" and 2-1/4" diameter.  Which is correct, and acceptable in the judged original classes?
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Ed Bertrand
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« Reply #6 on: August 15, 2013, 04:19:59 PM »

I "believe" the head pipes themselves are 2" where they attach to the exhaust manifolds, and then expand out to 2.25", but I'll ask John and/or Jerry to verify this. I say this because the same exhaust manifolds were used on the L48 (350/300), and this had a 2" based dual exhaust system. I don't think any 60's small block exhaust manifolds had anything greater than a 2" outlet other than the higher performance C2 Corvettes, which had 2.5".

Ed
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mickeystoys69RSSS
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« Reply #7 on: August 15, 2013, 06:53:56 PM »

On duel exhaust small blocks including the SS 350 had the 2". The 302 Z/28 and big blocks had the 2-1/4"
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z28z11
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« Reply #8 on: August 15, 2013, 09:10:53 PM »

RPO NC8 was standard on the 1969 Z28 until November 25th, 1968. After that it became optional, and then discontinued on May 19th, 1969.

Ed


Hey Ed,

I've got a documented X33 Z here locally, a May car, with an original chambered exhaust system on it, or what's left of it. Would the option have shown on the dealer invoice (the documentation) for this car ? I've got the MSO copy as well - I have always wondered if it was one of the last to have gotten the chambered exhaust before option delete -

Regards,
Steve
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1968 Z28 BRG/W
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1969 Z11 L48
llskis
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« Reply #9 on: August 16, 2013, 07:19:41 AM »

Can you guys tell me if an O1C build date Z/28 would of came factory with Chambered Exhaust? Thanks!

FWI: The last entry on the NC8 option in tha AIM is 6/13/69 indicating the RPO is cancelled. Larry
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1969 Z28 Non-Radio and Jeriry MacNeish Certified
paceme
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« Reply #10 on: August 16, 2013, 08:28:28 AM »

RPO NC8 was standard on the 1969 Z28 until November 25th, 1968. After that it became optional, and then discontinued on May 19th, 1969.

Ed


Hey Ed,

I've got a documented X33 Z here locally, a May car, with an original chambered exhaust system on it, or what's left of it. Would the option have shown on the dealer invoice (the documentation) for this car ? I've got the MSO copy as well - I have always wondered if it was one of the last to have gotten the chambered exhaust before option delete -

Regards,
Steve

Once the NC8 was no longer standard equipment, it became and option and would be listed on the invoice/window sticker like any other ordered option.
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Steve Shauger
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JohnZ
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« Reply #11 on: August 16, 2013, 09:22:15 AM »

Can you guys tell me if an O1C build date Z/28 would of came factory with Chambered Exhaust? Thanks!

FWI: The last entry on the NC8 option in tha AIM is 6/13/69 indicating the RPO is cancelled. Larry

Remember that the dates in the revision block in the A.I.M. are only the date the sheet was revised in the Drafting Room, not the date the revision occurred in production; NC8 was cancelled on May 19th.
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'69 Z/28
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Ed Bertrand
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« Reply #12 on: August 16, 2013, 11:53:38 AM »

In 1969 (for the N10 exhaust), both the Z28 and L48 had 2.25" head pipes EXCEPT where they attached to the exhaust manifolds. That "connection point" was 2" but I'm not sure how far that 2" pipe extended down until it turned into 2.25". The "over the axle" pipes were also 2.25", but the tail pipes were 2".

For NC8, the Z28 headpipes were 2.25" in diameter EXCEPT where they attached to the exhaust manifolds. Again, that "Connection point" was 2" like the N10, and again, I don't know how far down it extended until it turned into 2.25". The short "over the axle" pipes were 2" after that first chambered section and then the tailpipes were also 2".

Steve, take a look at page 109 in Jerry's "The Definitive 1969 Camaro Z28-SS396 Fact Book" and you'll see a shipper of a April, 1969 Z28 with the NC8 option.

Ed
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llskis
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« Reply #13 on: August 16, 2013, 12:05:27 PM »

Can you guys tell me if an O1C build date Z/28 would of came factory with Chambered Exhaust? Thanks!

FWI: The last entry on the NC8 option in tha AIM is 6/13/69 indicating the RPO is cancelled. Larry

Remember that the dates in the revision block in the A.I.M. are only the date the sheet was revised in the Drafting Room, not the date the revision occurred in production; NC8 was cancelled on May 19th.

What GM documantation backs up your(or anybody elses) exact date of May 19th?? Just curious. Larry
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Ed Bertrand
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« Reply #14 on: August 16, 2013, 12:47:41 PM »

Quote
What GM documantation backs up your(or anybody elses) exact date of May 19th?? Just curious. Larry

Larry, here's the the Zone Letter showing the discontinuation of the NC8 exhaust because of the incorporation of the chrome exhaust tips.

Ed

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