Core Plugs: Removal

WARNING: This page is about a different car, the 2003 Dodge Dakota. However, it is still accessible from the selected car via links, so may be relevant.

Drain the cooling system (Refer to STANDARD PROCEDURE--DRAINING COOLING SYSTEM 4.7L ).
Using a blunt tool such as a drift or a screw driver and a hammer, strike the bottom edge of the cup plug (Fig 1)

Fig 1: Removing Engine Core Plug
Courtesy of DAIMLERCHRYSLER CORP.
Using a suitable pair of pliers, grasp the core plug and remove.