The L and the F refer to the locations of the valve train in relation to the pistons. A flathead engine (like yours) is an L head. These engines were later redesigned for more horsepower by moving the intake valves into a larger head, which makes the intake flow more efficient. These were known as a F head.
Some guys get mixed up because of the F head and Flat head. They are not the same engine.
Long and short, yours is an L head (also known as a flathead.)
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