seriously slayer all u gotta do is pop ur hood and check for the label on the hood lid it should either be a 4.8l or a 5.3l and are u planning on going with a carburated 350 or a fuel injected i say why not an ls2 engines put some nice headers on it flowmaster ram intake or something and u will be set but i think those stock engines =(LS base) are pretty decent and fuel efficent and easy to mod