Most you can get out of the bore is 315ci and at that point id hope you did some sonic tests on the thickness of cylinder walls, sometimes the blocks shift during the casting process and when you max bore you'll end up into the water passages you'd be lucky if you could use liners after a catastrophe like that, LS1 blocks are notorious for core shift during the casting process. It might be economical for some but its not all that practical if your spending more then you would for a lager displacement engine. The higher power band has a lot to do with the bore size, stroke and its displacement, but not limited to the top end or cam, and that's just summing it up. I.E a larger bore diameters has better airflow because the cylinder wall is farther away from the valves so power band can be lower (and that all depends) the 3.736 bore is small and the valves are basically shrouded against the cylinder wall so it has to ramp up to achieve this, keeping a consistent feed of air flow into the intake system the pistons draw more air in on each opened intake lift as the rpm get higher.