The Power Stroke does NOT have basicly the same block as the IDI engine. There are 2 different engine families: The indirect injection (IDI) engine and the Power Stroke which is a direct injection engine. For 93 and 94 there were 2 IDI engines, a naturally asperated and a turbo charged version. The IDI engines inject their fuel into a precombustion chamber. These engines will be painted gray. For 94 there were 3 engines available, the 2 aforementioned IDI engines and the Power Stroke. The Power Stroke injects its fuel directly into the cylinder. These engines will be painted black.