Cylinder Heads
WARNING: This page does not describe the selected car, but rather 9 other vehicles, including the 2003 Ford Pickup, 2003 Ford F550 Super Duty, 2003 Ford F450 Super Duty, 2003 Ford Excursion, and 2003 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
The cylinder heads are designed with integral high pressure oil galleries to incorporate electronically controlled/hydraulically actuated fuel injectors. The fuel injectors are located in the center of the combustion chambers between the rocker arms.