Lesson 1/Learning Event 1
Engines that are classed by the position or arrangement of the intake and exhaust valves are called L-, T-, I-, or
F-head engines. The letters L, T, I, and F are formed by drawing a line through the cylinder and the valves.
However, whether the valves are located in the engine block or the cylinder head is also taken into account for
FIGURE 3. L-HEAD ENGINE.
L-head. In the L-head engine, both valves are located in the engine or cylinder block on one side of the
cylinder. Notice that a line drawn up through the cylinder and over to the valve heads forms an upside down