a friend told me that the z cars came out with dual over head cams is that true.

 

completely false. There is a special OS GIKEN head out with DOHC, but not stock.

 

that swhat i thought but he was sertin i figured this was the best place to ask

 

Please be more specific as to what year and model you are asking about.

If you are asking about the 204Z, 260Z, 280Z, or 280ZX the no. I personally do not know much about the later cars so I'm not in a position to answer beyond this.

 

Looking through MSA and Vic Brit last night to get all my rebuild supplies ordered, and did notice in the timing section that you can get "sprocket, cam, left" and "sprocket, cam, right" for Z's starting in 84 (the 300zx first year).
Dave

 

The 300ZX and up have twin cam (right?) due to the fact that they are a V6 motor.

 

Nissan Z Engine Lesson 101....
-S30's
L24 = 2.4 liter carb'd
L26 = 2.6 liter carb'd
L28E = 2.8 liter fuel injected
-S130's
L28E = 2.8 liter fuel injected
L28ET = 2.8 liter fuel injected turbo
-Z31's
VG30E = V6 3 liter fuel injected
VG30ET = v6 3 liter fuel injected turbo
-Z32's
VG30DE = V6 3 liter, DUAL OVERHEAD CAM, fuel injected
VG30DETT = V6 3 liter, DUAL OVERHEAD CAM, fuel injected twin-turbo