I don't know anything about this generation of engines in the 3 but the earlier 323 and MAYBE the Protoge' was using the lower end engine block from Ford and all the upper parts were from Mazda. At least that's what i was told by a tech, but i dont really have a problem with it as long as it's not a re-skin. You know, Mitsu 3000GT- Dodge Stealth, Mitsubishi Eclipse-Chrysler Sebring coupe, Chevy S-10 - Isuzu Hombre, Ford Ranger - Mazda B series trucks Isuzu Impulse-Geo Storm and my all time favorite Toyota Corolla -late 80's early 90's Chevy Nova, Geo Prizm. I actually bought one so cheap because the "car guy" hated Domestic cars.