Here is what Wikipedia states
Hemispherical cylinder heads have been used since at least 1901;[1] they were used by the Belgian car maker Pipe in 1905[2] and the 1907 Fiat 130 HP Grand Prix racer.[3] The Peugeot Grand Prix Car of 1912 and the Alfa Romeo Grand Prix car of 1914 both were four valve engines also, Daimler, and Riley were also using hemispherical combustion chambers. Stutz, beginning in 1912, used four-valve engines,[4] conceptually anticipating modern car engines. Other examples include the BMW double-pushrod design (adopted by Bristol Cars), the Peugeot 403, the Toyota T engine and Miller racing engines, and the Jaguar XK engine.[5]