Chevrolet/GMC 8.1L Longtube Truck Headers. ❕❕❕❕❕❕❕❕ With coffee can sized pistons and a super long stroke, this big engine puts out almost as much torque as aC7 ‘vette. But this baby hits peak torque waaaay down at 3200 rpm, where a heavy hauling work truck needs it. And that’s right in the sweet spot where a quality set of Longtube Headers will give you the most benefit. Mandrel bent 304 Stainless Steel. TIG welded by skilled American hands. bent 81