RE: outsourcing of engines
Yep, it is the king of the .50 Diesels turning the Graupner 12x7 at 10,200, I suspect the .53 is a 12x8 engine.
Martin, note the barrel retaining screw on the MVVS carb and how close the carb is on the Fox .50, I tried to put one of the MVVS carbs on the Fox but no go.