Join Date: May 2008. Posts: 529. More cubic inches is a great way to increase low end torque. A 4 inch stoke with your existing LS3 heads and a custom cam would provide a significant gain.n other words, I'd rather lift the tail of the torque curve rather than the head; if the head comes up 50 ft/lbs, that's fine-just not the objective. What the horsepower rating is at 5500 rpm doesn't concern me at all. It's a date car, not a drag car.