Abstract: Valve gear of preferably cam-over-rocker type for an internal combustion engine including a hydraulic lash adjustment means and in which the rocker is pivoted at one end on a stationary hydraulic adjuster. The lash adjuster operates from oil received under pressure from a gallery provided in the engine lubricant supply system. In the preferred practice, body of the adjuster is stationary with respect to the engine, and has a movable plunger with a one-way check valve for admitting and retaining oil in a chamber between the adjuster body and the plunger. A portion of the plunger extends beyond the body and has a rounded end for pivotally engaging the rocker arm with a reservoir in the plunger communicating with a one-way valve admitting oil to the chamber. An outlet metering means includes an aperture for controlling oil flow to the rocker. The plunger passage provides open communication between the pivot connection and the one-way check valve.