Recently I purchased a 1987 C4, two days later I picked up a set of 2006 wheels with 4000 miles on them. The front wheels have 245/40/18 tires on them that are 25" tall, the same hight as the stock tires, the rears have 285/35/19's that are 26" tall so the ride hight is almost unchanged.
Here are a couple shots taken before the swap of the stock wheels front and back.
This is the front with the new wheels and no spacers, as you can see they really need to be spaced out 1" so another set of spacers is on the way but they do fit without them.
To get these rears to fit I used 1" spacers and they are still about 1/4" in farther than the stock wheels but fit good. The rears will not fit without spacers because the tires hit the exhaust, rubber bump stop and the trailing arms.
A picture of the installed spacer before I cleaned up the rotors and repainted them.
And finally a side shot in the driveway just before dusk with my iPhone camera.
Here are a couple shots taken before the swap of the stock wheels front and back.
This is the front with the new wheels and no spacers, as you can see they really need to be spaced out 1" so another set of spacers is on the way but they do fit without them.
To get these rears to fit I used 1" spacers and they are still about 1/4" in farther than the stock wheels but fit good. The rears will not fit without spacers because the tires hit the exhaust, rubber bump stop and the trailing arms.
A picture of the installed spacer before I cleaned up the rotors and repainted them.
And finally a side shot in the driveway just before dusk with my iPhone camera.