The Hookers feature a layout similar to Hedman's full-length tubes, with the number 3 tube passing up along the valve cover, crowding the plug wires to cylinders 5 and 7. Also, the number 1, 5, and 7 tubes are routed low to go under the steering drag link in the chassis, hindering ground clearance. The 1 5⁄8-inch full-length headers provided quite an improvement in torque, with 423.9 lb-ft on tap. At 319, horsepower up top was down fractionally compared to the shorties. We would expect the results to be different if the engine was equipped with more cam duration, but at this mild spec, the tuning advantage of the long-tube header is largely lost up top due to cam timing.