Hmmmm

I'll have to actually check my results, but they were both in the range of 9kg, maybe 9.1 and 9.9.

And I have also felt the significant diference in weight between the two when picking them up. One came from an A12, the other from an A14. I was also surprised that the difference in weight was so little.

I took both down to the engine builder, his preference was to work on the A14 flywheel - so that's the one he's got.