I was wondering today how chevy came up with the "z28" name for the camaro. Does it have any significance, or is just something they thought sounded good? Any old chevy guys know?

 

Z28 was originally an RPO option on a standard Camaro.
It was like that from 1967-1974, then went away from 1975-1976, then returned in 1977 as its own model.

But as far as where "Z28" came from, that's a good question.

Maybe it was just the next number in line of RPO codes. Back in 1967, Z21, Z22, and Z23 were also RPOs. Possibly Z24, Z25, Z26, and Z27 were already in use on other cars, so Z28 was next.

I dunno, just a guess.

Edit: Then again, RPO Z27 was the Super Sport package from 1969-1972.

 

Like you said, it was an option on a 67 Camaro, and up.
Originally, it was a performance option and the "Z28" just happened to be the code for it on the option sheet.
Z27 was just before it and was just another option of some sort, if it wasn't so late, I would dig out my Camaro bible and tell you exactly what that option may have been.......but alas, not tonight.

 

Z22 = Rally Sport Trim Option
Z27 = Super Sport Trim Option (although in 1967 & 1968 they primarily sold SS's based on the engine RPO, you have to dig out the Factory Assembly manuals to find Z27 used prior to 1969 models where RPO Z27 got you the SS 396.)

 

not all Z codes mean a special submodel. Z49 for example if the code for Canadian/overseas export.

gt

 

The 2004 Grand Prix GTP has a WS6 option. It is the Competition Group.

see http://pontiac.com/grandprix/specs_wheels.jsp