The 97-03 bodystyle grandprixs have the same engine bays as the 04+ Grand Prixs the bodys style change was cosmetic, the chassis is the same. And to the last guy that posted if you'd look on the the first page of this thread their is a pic of a LS6 V8 in a dark blue 2001 grand prix. So way to go about not reading the thread very well aparently. As for moving the radiator support what for? That LS6 swap was done before the 05 GXP came out the OEM parts from a GXP would fit in a 97-03 Wbody!! Including all the suspension, seats engine, transmission, brakes wheels, ect. Oh and the engine bay and radiator support is OEM in that LS6 swap they just bolted it in and wired it all to work. The link with more info about the swap was posted as well. This swap would be much much easier now that the GXP, Monte SS, Lacross Super, and Impala SS have came out. It would really be as simple as getting a donor LS4 and a 97-03 shell and then wire it all to work. Tuning and wiring would be the hardest part! No need to modify the shell at all either.
