I always heard that the V8's were all aluminum and the V6's were all steel or something else. The reasoning that I heard was to keep the 50/50 weight distrubution. Had to use aluminum because of the extra pounds of the V8 and a heavy metal for the ligher V6.
Do know, maybe a wise tail.
nope - all LSes - aluminum hood, trunk lid, front fenders.
Then there is the various suspension components, engine, ...etc