“It needed hard part changes too. We had to change the cams and valves and grind the heads differently to make another 50 horsepower,” Huddleston said. Like its siblings, this 6-liter big block delivered nearly all its torque in that sweet spot between 2,000 and 4,500 rpm. “At 2,000 it gives 350 foot-pounds of torque and peaks at 420 horsepower at 4,500. And it burns 20 percent less fuel than the 8-liter,” Huddleston added.