Hi Charlie,Try researching the Subaru EE20. Early versions apparently had crank breakage issues; supposedly fixed. Haven't heard much about them lately, though. Never sold in USA, but I think there is an importer.
the weight totals 162kgs for a dressed engine as shown. There's a few in Europe and a team decided to convert it to an aircraft engine. However, this has gone quiet. Usually car companies don't like their engines flying.