6.9L IDI vs. 6.7L Power Stroke

From IDI to Ford's In-House Power Stroke


Ford entered the diesel industry with a mere 170 hp & 338 lb-ft of torque. Believe it or not, this was considered a lot in 1983, and the highly sought after International 6.9L had a great reputation. It is amazing how far Ford has come in the diesel market today, offering their own, FoMoCo built 6.7L Power Stroke with over 400 hp and 800 lb-ft of torque. Though naturally aspirated worked in the 80's, Ford did not even settle for a standard turbocharger on their new design. Rather, they equipped the 6.7L with the top of the line DualBoost, twin compressor turbocharger.



1983 6.9L IDI Diesel

2014 6.7L Power Stroke Diesel


International Harvester 6.9L IDI V8 Diesel

Ford 6.7L Power Stroke DI V-8 Diesel

Years of Operation:

1983 - 1987

2010 - present


6.9L, 420 cubic inches

6.7L, 409 cubic inches


Naturally aspirated

DualBoost turbocharger (twin compressors)

Injection Type:

Indirect injection, mechanical injection pump, mechanical injectors.

Direct injection, high pressure common rail, electronic injector controls

Block/Head Material:

Cast iron/cast iron

Compact graphite iron (CGI)/aluminum


170 horsepower @ 3,300 rpm

400 horsepower @ 2,800 rpm


338 lb-ft @ 1,400 rpm

800 lb-ft @ 1,600 rpm