The Power Stroke diesel brand name has been around since 1994, when it was applied to the 7.3-liter direct-injection turbodiesel co-developed with Navistar. Those who have followed Ford heavy-duty trucks closely know there have been several generations of Power Stroke, and that the latest version, which first debuted for the 2011 model year is a clean break from the Power Stroke's sometimes troubled past. Ford just commemorated the milestone of the installation of the 500,000th 6.7-liter "Scorpion" Power Stroke in a 2014 Ford Super Duty at its Louisville, Kentucky, truck assembly plant.

The 6.7-liter engine was a radically new design for both Ford and the HD truck segment, employing reverse-flow aluminum heads, a compacted graphite iron block, and a twin-compressor turbo. At its debut, the engine produced 390 hp and 735 lb-ft of torque, at the time a class-leading number. GM quickly raised the bar with the LML Duramax at 397 hp and 765 lb-ft. An ECU reflash on the Scorpion quickly brought it up to 400 hp and 800 lb-ft. Just last week at the State Fair of Texas, Ford debuted a revised Power Stroke for the 2015 Super Duty with a new, larger single-compressor turbo and promises of greater power output, although official figures were not announced.

Source: Ford