Abstract: An improved carburetion process providing improved vaporization and a more uniform distribution of the fuel throughout the entire mass of the intake air stream of an internal combustion engine. A cylinder-cone combination air intake valve replaces the conventional butterfly type. Intermingling of fuel and air takes place in a pre-mix chamber in said cone base prior to exiting via multiple orifices through the cone base perimeter to mix with the main intake air stream. Metering rod control of pre-mix chamber absolute pressures results in variable but precisely controllable fuel/air ratios.