What's the difference...

[MarkuzLS1]

...between the engine in an '03-'04 Cobra and an '03-'04 Mach 1? Besides the Mach 1 not being supercharged, obviously. Is the lack of forced induction the only difference?

[SpectorV]

The compression ratio is a bit different and the heads are different as well (If I remember right) in the Mach 1's. The crank in the autos is not forged and it is in the manual Mach 1's. The Pistons and Rods are not forged either. I am sure there are some other differences, those are the only ones I can think of at the moment. The cams may differ as well but I have never heard anyone talk about it.

[bullitt482]

The Mach's have an aluminum block and the termy's have a cast iron.