So, do you need longer wheel studs or different lug nuts because of the spacer? Sorry for all the questions, but I really want the same thing and don't want to spring for the ZO6 wheels and be dissapointed.Dave,
You would need the 3/4" adapter front and rear to do this on a 1988-96 model.
:agree: The adapter may make the wheels stick out further in the fenders.Yes, they will fit. However, you will have to run a 3/4" wheel spacer/adapter as the offset is too deep to bolt right on your C4. The earlier C4's require a 1 1/4" adapter.
You can go to a 305-25-19 on the rear and keep the rear tire height darn close to stock C4 so the speed-o calibration is okay. Otherwise, the C6 rears are just tall enough to make your speed-o read slow.
In my opinion, it is worth the extra effort, as the 18/19 rims look SOOOOO good on these cars. This picture below is my re-bodied 85 (has 91-up panels) sporting C6 wheels. NOTE - there is no engine or trans in the car in these pics - so it is sitting up like a truck: