I may be mistaken but the gto's have a diffrent block... I don't think that's it. Something is slightly diffrent than the plane old ls1 For some reason ls6 comes to mind.

I have to look it up when I get a chance.

Lol if u look at the thread I posted, in the second page, some dude tells me to change my bong water. Lol they do act like they drive lambos...