Author Topic: 1968 Z28 smog tubes  (Read 5840 times)

Jerry@CHP

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Re: 1968 Z28 smog tubes
« Reply #15 on: December 02, 2010, 04:55:27 AM »
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 

fireZ

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Re: 1968 Z28 smog tubes
« Reply #16 on: December 02, 2010, 09:44:00 PM »
Is that 67 smog tube still available?I would use that instead of cutting up and rewelding a 68 tube
1968 Z28 LA Built
LIC # RPO Z28

68camaroz28

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Re: 1968 Z28 smog tubes
« Reply #17 on: December 02, 2010, 10:07:54 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!
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
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Jerry@CHP

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Re: 1968 Z28 smog tubes
« Reply #18 on: December 02, 2010, 11:35:42 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

Flowjoe

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Re: 1968 Z28 smog tubes
« Reply #19 on: December 07, 2010, 06:32:35 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.

Jerry@CHP

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Re: 1968 Z28 smog tubes
« Reply #20 on: December 08, 2010, 01:30:27 AM »
Flowjoe,

Yes if it's a documented car with paperwork.

Thanks,

Jerry

fireZ

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Re: 1968 Z28 smog tubes
« Reply #21 on: January 06, 2011, 09:09:10 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
1968 Z28 LA Built
LIC # RPO Z28

fireZ

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Re: 1968 Z28 smog tubes
« Reply #22 on: January 07, 2011, 05:43:24 PM »
What pipe plugs were used.Hex head or allen key plugs?
1968 Z28 LA Built
LIC # RPO Z28

JohnZ

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

P/N 3889330 hex-head 1/4"-18 straight pipe thread plug.
'69 Z/28
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fireZ

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Re: 1968 Z28 smog tubes
« Reply #24 on: January 08, 2011, 06:47:20 PM »
are the plugs an indented hex head?
1968 Z28 LA Built
LIC # RPO Z28

169INDY

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Re: 1968 Z28 smog tubes
« Reply #25 on: January 14, 2011, 12:29:35 AM »
Socket = indented
Hex Head = 'raised' Hex head
Jim
68 SS/RS L35 Th-400 LOS
69 Pace Car L48 Th-350 LOS

fireZ

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Re: 1968 Z28 smog tubes
« Reply #26 on: January 14, 2011, 01:11:17 PM »
Thanks for that explanation
1968 Z28 LA Built
LIC # RPO Z28