Sue's SS Aero is JAP engined.
Photo
here.
I don't know any current racers who use an an Anzani engine. They have a dreadful reputation stemming from the fact in period, valves broke and the cancellation of the Morgan contract and this combined with the fact Anzani unsuccessfully sued Morgan led to the company going bankrupt.
In modern times of course, the valves have long been replaced with ok ones, but the reputation for fragility is still there, albeit misplaced.
Most racers use JAPs, a few Matchless and a few Blackburne.
