The horsepower increase is actual. It is not an adjusted rating. I don't know how to make it much clearer. Different cam, different cam, different cam...
On 2001-04-04 16:19, Zed_six spewed forth this drivel:
I think you hit the nail on the head. Let's be realistic. GM isn't going to do any drastic changes on the 2002 Z06 to make 405 SAE rated horsepower. What is likely is that the 405HP is realistic to the 385HP rating now enjoyed by our fellow Z06 bretheren.