With the manifold portion of our test complete, we moved on to tube headers. First was a set of Hedman shorties with a tube diameter of 151/48 inches. The shorties bolted up to the block nicely. However, in the '70 A-Body Duster we once tried them in, the collector exit was too close to the steering drag link to connect effectively. We haven't tried to fit them in other chassis types. The shorties did provide a good power increase when compared to all of the iron manifolds tested, recording 322 hp at 4,700 rpm and 416.7 lb-ft of torque. Spark-plug wire clearance was also good.