Yeah, the Escalade and Denali have the LQ9. Maybe some others had it as an option. Look for vehicles listing 345 hp. But the LQ4 is no slouch either, it just has 9.6 compression instead of the 10-1 that the LQ9 has. Otherwise they are the same. The LQ4s ranged from 285 to 310 HP basically the camshaft was the difference I think. If you do Google searches on LQ9 and LQ4 you will find a bunch of info. If you want to go bigger cubes, there are a number of companies building stroker kits that will take you over 400 cu in.

Pat