1 inch 'square' engine

I call this engine my Square engine because its 1 inch bore and stroke and because its.... Square. Its dated 1952 on one side.

Its a flash steam hydroplane engine, with a piston valve for inlet and again a uniflow exhaust. Its also ballraced, and has a fully adjustable eccentric driving the inlet valve. I intend to have this engine in a boat and racing in the A/S class for the 2015 season.