how do you figure? you dont gain Power from a Block itself? What edge do I have over a LS1 if I have LS1 heads other then better flowing oil gallerys that are in the LS6 block? I still have the LS1 compression ratio of 10.1 where the LS6 is 10.5 and The LS6’s have Sodium filled valves on their 243 heads when I have 241 heads.