Thats what they like to say but before 02 the LS-1 was rated at 340 in the Vettes. The way I understnad it is the throttle body is narower on the SS and they added a more restrictive exhaust than the vettes. I have heard that if F-body owners put the C5's intake and Throttle Body thanand tweek the chip than the power is brought up to 350. I think it has to due more with insurance than keeping vette owners happy beacaues the Caddilac CTS-V has the same exact LS-6 that is in mine. They rate the caddy at 400 vs 405 but whats 5hp