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Ford f150 horsepower 5.4 engine what does 3v mean?

In the context of a Ford F-150's 5.4L engine, "3V" refers to the three-valve per cylinder design. This means each cylinder in the engine has three valves: two intake valves and one exhaust valve. This design was used in some years of the 5.4L Triton engine to improve airflow and combustion efficiency compared to older two-valve-per-cylinder designs.