The Boland V-8 was an aircraft engine that was developed by the Boland Brothers for use in their tailless aircraft.

Between 1908 and 1914, four versions of this motor were produced ranging in power from 60 hp (45 kW) to 125 hp (93 kW).

The Boland motors all used an unusual concentric overhead valve.

These were actuated by a single push rod and rocker arm.

[1][2] Data from Airplane Engine Encyclopedia.