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Navistar/International dealers sell a 600 watt block heater that screws into any 3/4 npt. hole for $38.00 out the door. And it works great.
http://www.shopdiesel.com/_e/Block_Heaters/product/ZBL3500069/International_Factory_Block_Heater_6_0L_Powerstroke.htm
Here is the link to it through Shop...