ive searched and searched and cant find anything, and im pretty sure its because it wasnt a factory option. does anyone know what the part number is for the OEM engine block heater for a 2010 5.4L? id really appreciate it.

 

Try this link; item #25. But that site doesn't show the PN, and it doesn't have the 2010 F150 (that link is 2009), and the heater was apparently only used in the 4.6L.

The base PN for the heater in the 90s was 6A051: