Big 3 Diesel is your source for diesel comparisons. Compare diesel engines like the 6.0, 6.4, & 7.3 liter Power Stroke to the 5.9/6.7 liter Cummins and 6.6 liter Duramax engines. Big 3 Diesel also offers comparisons of older diesel engines, such as the 6.9 and 7.3 liter Ford IDI and 6.2/6.5 liter GM diesels. - (Read more)