Lesson 1/Learning Event 1
Valve Arrangements
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
this classification.
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
letter L
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