First up, the trusty 2.1 wbx. c/w flywheel and clutch, bone dry, single pulley, puny 45A alternator. No induction system, exhaust, PAS pump or a/c.

Almost exactly 90 kg (86 without the alt.) which is more than I had been led to believe.
To follow: 5 cyl Audi, Subaru EJ22 and hopefully some other popular swaps, I can always take the spring balance to the engine!