Jeep’s 4.0-liter straight-six engine is iconic. Much like the Ford 300, it’s a down-and-dirty truck engine that stayed in production for decades. Also like the Ford 300, it can make a ton of power ...
The first straight-six internal combustion engine design, produced by Spyker in 1903, led to widespread usage of similar designs over the following years. While V8 power would eventually dominate the ...