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Author Topic: 1968 Z28 smog tubes  (Read 3919 times)
fireZ
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« on: November 24, 2010, 07:35:29 PM »

Were the smog tubes on a cowl plenum car the same as the smog tubes used on a open breather car?
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1968 Z28 LA Built
LIC # RPO Z28
Jerry@CHP
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« Reply #1 on: November 25, 2010, 08:27:59 AM »

One set of std. tubes were used on the 68 Z28 and they do not work with a CP air cleaner.  The right side will not clear the duct.

These CP air cleaners came in the trunk and it was up to the dealer or new owner to deal with installiing the air cleaner.  That meant removing the smog stuff.  There is a right side Nova tube with 90 degree angle that will work but it is not technically correct.

Jerry
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fireZ
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« Reply #2 on: November 25, 2010, 09:00:00 AM »

So there was not a camaro specific part number Jerry ?Any were I could I possibly see a picture to know what I need? Thanks and Happy Thanksgiving
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1968 Z28 LA Built
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fireZ
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« Reply #3 on: November 25, 2010, 09:02:29 AM »

Would the nova part cause deductions on a judging sheet?
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1968 Z28 LA Built
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Jerry@CHP
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« Reply #4 on: November 27, 2010, 05:15:26 PM »

It's a catch 22 situation.  There would be a deduction.  The plenum AC was not designed to work in concert with the smog eq.  Everyone took it off and threw it away.,

JM
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john302
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« Reply #5 on: November 27, 2010, 06:32:16 PM »

I am having the same problem.Should I ditch the smog and go with the repop factory headers??Smog and the cp look goofy together.I bet every car that received a cp also got a set of headers. The headers look real nice with the cp,looked at Jerrys pics a hundred times. The smog system is original to the car and is mint and so are the original tubes. Once the car is done there is no changing it back. Also I have loads of docs ,window sticker,order sheet ect..So anyone could see it never had headers or a cp. But 67 68 z/28 are real plain looking and the cp and headers add alot of snap under the hood. The hole is cut in the firewall already ,but the headers are in the basement . The smog tube under the cp will always look incorrect .What should I do? John
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john302
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« Reply #6 on: November 27, 2010, 06:58:22 PM »

How about the indent in the cp for the smog. Why is it in there if the tubes dont work?thanks John
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fireZ
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« Reply #7 on: November 27, 2010, 08:44:17 PM »

Yes it is hard to believe that the indent is on the cp which to me would mean it was meant to work with the smog.
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1968 Z28 LA Built
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Jerry@CHP
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« Reply #8 on: November 28, 2010, 09:49:13 AM »

That is a good question.  I can tell you that most people did not get the headers because it doubled the cost of the Z28 option.  Not cost effective.  And the Hooker headers were a better header so most added them after the purchase of the car.  I have only seen two documented cars that had both.  My white car and Sam Bishop's dark green Z28.

If you experienced living back in the day, this all makes sensebut to many of the younger generation people who are trying to restore a car today, it's difficult to process why and how things happened back then.

Jerry
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fireZ
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« Reply #9 on: November 28, 2010, 01:02:20 PM »

Well put Jerry,I guess I will try and route the hose on a 90 degree angle. I may take an old smog tube and cut the 90 degree tube from it and re-weld it to a tube that I have removed the straight up tube from. It will not be factory correct but that way   I will have a original CP set-up with original smog tube modified. I can tig weld at home,it will give me a project for a while. Thanks Jerry
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1968 Z28 LA Built
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Charley
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« Reply #10 on: November 28, 2010, 02:49:47 PM »

Jerry. This was posted on the Yenko site. What tube is he talking about ?



jack hatch Offline
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Registered: 11/27/10
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I have a set of smog tubes that I acquired from Jerry MacNeish years ago. The passenger side tube is rare and built specifically for the Cowl Plenum installation.The passenger side tube sweeps 90 degreees in the direction of the tube itself pointing to the smog pump. It also starts its sweep at the firewall end of the tube to allow room for the hose to connect to the smog pump The drivers side is the same.
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Jerry@CHP
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« Reply #11 on: November 28, 2010, 04:43:43 PM »

Charley,

I got him that '70's Nova tube with the 90 degree bend to clear the air cleaner.  I had explained this was the only way to run both without clearance issues.

Jerry
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68camaroz28
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« Reply #12 on: December 01, 2010, 06:46:12 PM »

This information kinda hit me between the eyes as I have a complete (many parts NOS) smog system purchased years ago and the car is a air cowl plenum car. Now what do I do?Huh? Jerry, there was one magnificent 67 Z/28 (one of one due to COPO paint scheme that looked hugger orange) at this years Legends judging that was restored by Lucas Restoration and painted by East Coast Muscle Cars and that car was a LA car with air cowl air cleaner and smog set up. Are LA cars different or was the Nova tube set up used for that application as well or some other modification that would not deduct points? I'm confused on what to do as I was planning and hoping on having our car judged by the legend judge team.
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Chick
68 Z/28 NOR 01B Orig motor/trans/rear
69 Z/28 NOR 07A Orig Block & GM Cross-ram/carbs
69 L34 Rest. Nova Father/Son Car
69 L78 Surv Nova Purch 4/69 31K miles
67 L89 Corv Tribute
68 Corv 427/400 Orig motor
07 Corv Z06
R 68Z build- http://www.camaros.net/forums/showthread.php?t=182584
1968RSZ28
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« Reply #13 on: December 01, 2010, 09:51:27 PM »

Jerry, there was one magnificent 67 Z/28 (one of one due to COPO paint scheme that looked hugger orange) at this years Legends judging that was restored by Lucas Restoration and painted by East Coast Muscle Cars and that car was a LA car with air cowl air cleaner and smog set up.

http://lucas-restorations.com/pauls67z.aspx

Paul
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68camaroz28
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« Reply #14 on: December 01, 2010, 10:39:36 PM »

Jerry, there was one magnificent 67 Z/28 (one of one due to COPO paint scheme that looked hugger orange) at this years Legends judging that was restored by Lucas Restoration and painted by East Coast Muscle Cars and that car was a LA car with air cowl air cleaner and smog set up.

http://lucas-restorations.com/pauls67z.aspx

Paul

That's the one Paul. Just one great looking Camaro. Here is a picture of what I'm referring to and wondering how or what they used and it was judged at the show. Again, one great looking Camaro.
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Chick
68 Z/28 NOR 01B Orig motor/trans/rear
69 Z/28 NOR 07A Orig Block & GM Cross-ram/carbs
69 L34 Rest. Nova Father/Son Car
69 L78 Surv Nova Purch 4/69 31K miles
67 L89 Corv Tribute
68 Corv 427/400 Orig motor
07 Corv Z06
R 68Z build- http://www.camaros.net/forums/showthread.php?t=182584
Jerry@CHP
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« Reply #15 on: December 01, 2010, 11:55:27 PM »

The '67 right side tube is shorter and the check valve is completely different and will work without cleanace issues.  It' bends off on 2-45 degree angles.  The '68 tube is taller and won't work like that.

It's just the way it is.  Back in the day, no one ran smog and a cowl plenum AC.  My Chevelle was two weeks old when I ripped off the smog and threw it in the trash. 

Jerry 
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fireZ
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« Reply #16 on: December 02, 2010, 04:44:00 PM »

Is that 67 smog tube still available?I would use that instead of cutting up and rewelding a 68 tube
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1968 Z28 LA Built
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68camaroz28
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« Reply #17 on: December 02, 2010, 05:07:54 PM »

Is that 67 smog tube still available?I would use that instead of cutting up and rewelding a 68 tube

Exactly what I was thinking!
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Chick
68 Z/28 NOR 01B Orig motor/trans/rear
69 Z/28 NOR 07A Orig Block & GM Cross-ram/carbs
69 L34 Rest. Nova Father/Son Car
69 L78 Surv Nova Purch 4/69 31K miles
67 L89 Corv Tribute
68 Corv 427/400 Orig motor
07 Corv Z06
R 68Z build- http://www.camaros.net/forums/showthread.php?t=182584
Jerry@CHP
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« Reply #18 on: December 02, 2010, 06:35:42 PM »

It's a completely different tube with different bends, and the check valve is different with two ports on 45 degree angles.  NG.

Jerry
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Flowjoe
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« Reply #19 on: December 07, 2010, 01:32:35 PM »

That is a good question.  I can tell you that most people did not get the headers because it doubled the cost of the Z28 option.  Not cost effective.  And the Hooker headers were a better header so most added them after the purchase of the car.  I have only seen two documented cars that had both.  My white car and Sam Bishop's dark green Z28.

If you experienced living back in the day, this all makes sensebut to many of the younger generation people who are trying to restore a car today, it's difficult to process why and how things happened back then.

Jerry
That is a good question.  I can tell you that most people did not get the headers because it doubled the cost of the Z28 option.  Not cost effective.  And the Hooker headers were a better header so most added them after the purchase of the car.  I have only seen two documented cars that had both.  My white car and Sam Bishop's dark green Z28.

If you experienced living back in the day, this all makes sensebut to many of the younger generation people who are trying to restore a car today, it's difficult to process why and how things happened back then.

Jerry

I know of a '68 in the SF Bay area that has both factory headers and the CP - if that's at all helpful to your data Jerry.
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Jerry@CHP
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« Reply #20 on: December 07, 2010, 08:30:27 PM »

Flowjoe,

Yes if it's a documented car with paperwork.

Thanks,

Jerry
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fireZ
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« Reply #21 on: January 06, 2011, 04:09:10 PM »

How would a car be judged if it had the correct 1968 cowl plenum and had the original exhaust manifolds with plugs in the smog holes? Second question is my car came with CP in backseat when I got it years back but the pop with the  car does not denote the CP anywhere on pop
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1968 Z28 LA Built
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fireZ
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« Reply #22 on: January 07, 2011, 12:43:24 PM »

What pipe plugs were used.Hex head or allen key plugs?
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1968 Z28 LA Built
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JohnZ
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« Reply #23 on: January 07, 2011, 02:00:38 PM »

What pipe plugs were used.Hex head or allen key plugs?

P/N 3889330 hex-head 1/4"-18 straight pipe thread plug.
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'69 Z/28
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fireZ
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« Reply #24 on: January 08, 2011, 01:47:20 PM »

are the plugs an indented hex head?
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1968 Z28 LA Built
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« Reply #25 on: January 13, 2011, 07:29:35 PM »

Socket = indented
Hex Head = 'raised' Hex head
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Jim
68 SS/RS L35 Th-400 LOS
69 Pace Car L48 Th-350 LOS
fireZ
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« Reply #26 on: January 14, 2011, 08:11:17 AM »

Thanks for that explanation
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1968 Z28 LA Built
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