It might be worth checking the part number on your silencer if it’s a Morgan item. My first car had an engine vibration spot somewhere around 3K rpm. The engine was very smooth either side of this narrow rev window. Motorway driving was a pain as you had to avoid this engine speed at all cost otherwise you risked losing your fillings. Could feel it through the steering wheel and body rather than any noise. I did a lot of investigation but traced it back to a resonance in the silencer. It was the straight through silencer part number MEX 1107. I swapped it for the baffled version MEX 1105 and the resonance was gone.
![[Linked Image]](https://dl.dropboxusercontent.com/s/6hxh5z31sl81s8m/silencer3.jpg)
