My New '68 Camaro Z/28 Butternut Yellow

[JohnZ]

<< I read somewhere that you HAVE to have something in the top of the smog pump, or it will keep pumping into the manifolds and this is NOT good. Some kind of valve? True? What goes in this hole? Can I buy one? Can I run the engine without the belt attached to the pump? ... Danny >>

What goes in that hole is already there - it's a pressed-in pressure relief valve, to protect the pump in the unlikely event that the diverter valve sticks closed. The more common failure mode for the diverter valve is that it sticks open, pumping air into the manifold tubes all the time - that happens when the rubber diaphragm inside the diverter valve fails (and they all do eventually) and the valve then defaults by design to the open position, also causing a vacuum leak through the vacuum signal hose.

[1968 Z28]

What's missing is the Black Plastic insert that fits inside the center hole....it ID's the valve pressure setting.  BTW....mine is missing also.....if you find a source let us all know.

[1968 Z28]

What's missing is the Black Plastic insert that fits inside the center hole....it ID's the valve pressure setting.  BTW....mine is missing also.....if you find a source let us all know.

Just to make sure you know what I am referring to.....little black thing in middle of valve.

     

     

[dannystarr]

JohnZ,
 Can I pull the belt and run it without? I here guys talk about deveining. I guess that means to pull the guts out of the pump. I would rather not do that. What can I do or not do? Thanx... Danny

[JohnZ]

JohnZ,
 Can I pull the belt and run it without? I here guys talk about deveining. I guess that means to pull the guts out of the pump. I would rather not do that. What can I do or not do? Thanx... Danny

You can run it without the belt if you like.

[dannystarr]

JohnZ sorry to bother ya all the time. But follow-up, so I pull the belt, great, NOW...can I ALSO then pull the vacuum line, or should I leave THAT connected? Will I have a vacuum leak if I leave it? ... Danny

[x66 714]

I put a BB in my vacuum line....Joe

[KurtS]

Great car and great pics.
All the #'s look good.
Frame stencil is the date: 5 31 68?
Carb is probably original.
What's the # on the pitman arm?
The two letter codes are the broadcast codes for the part - production shorthand for the part #. DF, MO, etc.

[dannystarr]

Hey Kurt, thank you SO much for checking in... Just wanna make sure things are good. I thought I had the pitman arm pictures in here somewhere but maybe not. Here is what I have in my picture file.
 
 What makes you think the carb is original? Is this the norm being dated 4 months away from most everything else on the car? You got many other documented '68 original cars with this early carb dating?
Danny

[dutch]

That doesn't look close to any number I've seen on pitman arms for Z 2/8's..

[bcmiller]

Hey Kurt, thank you SO much for checking in... Just wanna make sure things are good. I thought I had the pitman arm pictures in here somewhere but maybe not. Here is what I have in my picture file.
 
 What makes you think the carb is original? Is this the norm being dated 4 months away from most everything else on the car? You got many other documented '68 original cars with this early carb dating?
Danny

I am not Kurt, but I thought I had posted a while back and said that I thought your carb was probably original but Kurt would have a better idea for sure.  That big of a gap is not the norm, but you have so many other original components it would be hard for me to believe it is not original.  Production on Z28s was ramping around that time the carb was assembled so it could have gotten shuffled back not used right away.

Let me check on the pitman arm.

[bcmiller]

Pitman arm is correct.  Fast ratio manual steering - length is 5.8 inches.  

Lots of good steering information here from David Pozzi's site. 
http://www.pozziracing.com/camaro_steering.htm

[jdv69z]

For reference, my 10B Oct 68 build 69 Z/28 has a carb dated 872. I believe that is 2nd week of July 1968. So carb is 11-12 weeks ahead of assembly.

[dutch]

My Z 2/8 pitman arm number - special steering, non-power steering was 3935075A - and as per Pozzi's site it looks like the number pictured is from a 1967 Z 2/8 Pitman Arm.. according to what I read there.
The cast numbers on the original Pitman on my '68 were confirmed as correct by many other Z 2/8 owners on this site that had the same numbers on their cars, when I was trying to ID it and find a replacement a year or more back

[69Z28-RS]

For reference, my 10B Oct 68 build 69 Z/28 has a carb dated 872. I believe that is 2nd week of July 1968. So carb is 11-12 weeks ahead of assembly.

My mid September '69 Z28 carburetor is a 962..  also approx 12 weeks ahead of car production...