1990 Z51 package...where to find details?

[HallenTi]

I *THINK* I have the Z51 option on my 1990 Coupe (I think I will order a "sticker" for the VIN from the Corvette Museum to be sure). Where can I find detailed information on the Z51 option? (ie. differences between the Z51 option and stock). Tim

 

[vigman]

Did you look under the center console?

Sometimes the RPO sticker is on the back ( underside ) of the center console.


Vig!

 

[c4cruiser]

Here's a link to the technical specs of the suspension for C4's created by Hib Halvorson:
http://www.idavette.net/susp_chart.htm

Spring rates, sway bar sizes, shock rates and wheel info are broke down by year and suspension RPO.

Another place to look for the decal with the RPO codes is the underside of the lid in the storage compartment behind the passenger seat.

 

[HallenTi]

Thanks for the information here! I didn't find the sheet, but I did pick up a pretty dandy book called "Cor-Vette Specs" by Mike Antonick, which deals with 1984-1996 models. Although the Idaho Corvette page had more specific information, what the book says about it is: "Z51 included RPO KC4 (engine cooler), heavy-duty front and rear springs, larger front brakes, and heavy-duty front and rear stabilizer bars. Available with manual transmission coupes only." Tim

 

[Eagle85C4]

Hmmmm....my 85 Z-51 is an automatic....

 

[HallenTi]

Eagle85C4,

A quick check in the same book shows me this about the Z51 option for the 1985:

"RPO Z51 included FG3 Delco-Bilstein shock absorbers, VO8 heavy-duty cooling, heavy-duty front and rear springs, heav-duty front and rear stabilizers and bushings, fast steering ratio (13.0:1), and 16x9.5 inch wheels". Tim

 

[Eagle85C4]

Then there is the oil cooler, 2 fans, 120 amp alternator...