There isn't a single torque specification for the front hub nuts on a Lincoln Town Car. The torque specification will vary depending on the year and model of the Town Car (as well as whether you're referring to wheel lug nuts or other hub-related fasteners).
To find the correct torque specification, you must consult your vehicle's owner's manual or a reputable repair manual specific to your year and model. Using an incorrect torque value can lead to loose wheels (unsafe!) or damaged components.
