Originally Posted by mkorgan
While I am just speculating, I can't imagine that GM would have to provide separate crash test data if there has not been any structural changes to the frame of the car. The Z/28 is really a highly modified SS if I remember correctly. No way they crash test a fully equipped Z/28 if there is no crumble zone or impact zone changes as it has the same frame as the SS if I am remembering correctly.
The change in ride height required require crash testing gorgeous shiny new Z/28s. There are BIG BUCKS in the new Z/28!