SMOG TUBES

[ALLZS]

was the driver side smog tube on a early 3 rd week of   sept 68 built 1969  Z different than the late cars

[Jerry@CHP]

There was a changed in Feb to a 2nd design L/S tube which was used for the 1968 model year Z28.  The early cars would have the std L/S tube.  I have photos in my fact book showing the tubes.

Jerry