The Power Stroke is an electronically controlled, direct injection engine with a 4.11 in (104 mm) bore and 4.18 in (106 mm) stroke creating a displacement of 444 cu in (7.3 L). It has a 17.5:1 compression ratio, and has a dry weight of approximately 920 lbs. This engine produced up to 250 hp (190 kW) and 505 lb·ft (685 N·m) of torque in automatic trucks during the last years of production, and 275 hp (205 kW) and 520 lb·ft (705 N·m) of torque in manual trucks. The 1994.5 to 1996/97 DI Power stroke had "single shot" HEUI (hydraulically actuated electronic unit injection) fuel injectors and ran a 15° high pressure oil pump (HPOP) to create the necessary oil pressure to fire the fuel injectors. 1994.5-1997 trucks used a cam driven fuel pump, whereas the 1999-2003 trucks used a frame rail mounted electric fuel pump.
