For Ford 7.3 L 1500W Block Heater Powerstroke Diesel High Wattage F 250 350 - Walmart.com
JEGS 555-21123: 1 3/4 in. Core Plug Block Heater | 600 Watts @ 12.5A @ 120VAC | Installs into Block's Core Plug Hole | Fits Most 1965-1989 Big Block Chevy MKIV & Ford FE Engines | Includes 4 1/2 ft. Grounded Power Cord - JEGS