GMC's huge Twin Six V12 gas engine was made to take on its diesel counterparts, powering fire trucks and farm machines, but ...

Essentially, it’s a six-stroke engine that relies on a different stroke length for one of the strokes. The first three ...

The engine continued to be made until 2003, garnering a massive fanbase. A current High-Output 6.7-liter Power Stroke turbodiesel makes 500 horsepower and 1,200 lb-ft of torque. The Drive reported ...