The 'rutting dinosaur' howl was specific to aircraft with 200-ser engines, due to the intake geometry and occurred at particular combinations of power setting and speed. In normal operations, the howl would normally only be heard during 2-eng go-arounds until power was reduced to 93%. On 4-eng go-arounds we were only supposed to use 80%.... But out of sight of the grown ups it wasn't unknown for crews to fly a practice diversion to go-around, then climb out with all 4 at max chat. THAT caused a most satisfying howl! I once got the attention of most of Wichita doing that after a fly by at McConnell AFB!
300-ser engined aircraft had a larger compressor intake, so didn't howl. Hence '558 would howl, but '655 at Wellesbourne Mountford can ROAR, but not howl.