Who has the highest revving small block?

Old Honda cafe race motorcycles could pull 18000 rpm out of a 2 stroke. Piston speed on a LA exceeds some design standard at 7500 rpm. Just read it somewhere...

trivial fact: there is a youtube video of a guy who spun a magnetic dowl at >1,000,000 rpm. Magnetically levitated, spun in an electric coil and measured by a hall effect sensor. Thats humming.