The term "Bulletproof" has become quite popular in the diesel community, especially among Ford's 6.0 Power Stroke engine owners. Introduced in 2003, this V8 powertrain was used in vehicles like ...

So, in 2003, Ford unveiled its second Power Stroke engine. The 6.0 had features like a variable ... failure are leaving the engine as stock, or "bulletproofing" it before the head gasket is ...