GENERAL MOTORS PRESS RELEASE:
http://media.gm.com/servlet/Gateway...s/viewpressreldetail.do?domain=12&docid=35824
Looks like it's 430hp for the LS3 (or 436hp with optional exhaust), and the 2008 Z06 keeps the 505hp LS7.

http://media.gm.com/servlet/Gateway...s/viewpressreldetail.do?domain=12&docid=35824
Looks like it's 430hp for the LS3 (or 436hp with optional exhaust), and the 2008 Z06 keeps the 505hp LS7.