An arrangement for a valve train assembly in an internal combustion engine includes: a valve train component having a body that defines a bore with a first bore section and a second bore section, the first bore section having a diameter that is greater than a diameter of the second bore section; and a hydraulic lash adjustor having a plunger mounted for reciprocal sliding movement in the second bore section to enable the hydraulic lash adjustor to expand and contract, the hydraulic lash adjustor further including a first chamber and a second chamber. The first chamber is at least partly in the first bore section and can hold hydraulic fluid for flowing into the second chamber through a valve in response to the hydraulic lash adjustor expanding.