[1990gtguy]

ok guys im a 5.0 guy and have owned an 95, 90 and 88 but im graduating college in 8 weeks and want to buy my self a graduation present i want a 03-04 mach1 my question is whats the difference in the engies in a mach 1 and a 99-04 gt? other than the forged crank in the mach and the 03-04 cobra heads? are they both aluminum? thanks!

[Quick4.6]

Simply put, the GT is a 16-Valve SOHC motor and the MACH is a 32-Valve DOHC motor. They both have aluminum heads, but there's a big difference between the two!

[98BlackGT]

The Mach 1 has an all aluminum (block and heads) 32 valve, double overhead cam motor. It has 10.1 to 1 compression ratio, and was underrated by Ford at 305hp and 320tq. It has intake cams from the Lincoln Navigator 5.4L mod motor, which give the car much more favorable low end and mid range torque over previous 4V Cobra motors, but sacrifices some of the high end horsepower the earlier motors were known for.

[1990gtguy]

haha o yea forgot it was dohc, whats the mach block capable of holding reliably as far as hp

[2Manystangs]

Well the mach unfortunately doesn't have forged internals so it's hp potential is limited, I recommend just waiting, saving, and getting a terminator.

[1990gtguy]

yea wish i could get a terminator but i have to get a new car when i get out of school

[98BlackGT]

Originally Posted by 1990gtguy

haha o yea forgot it was dohc, whats the mach block capable of holding reliably as far as hp

The block isn't an issue, it's more than capable of handling 700+ horsepower. The problem is the crack powdered rods and pistons. Stock Mach 1 motors can handle FI applications under low boost of about 8-9psi and producing around 450-465rwhp. They also take real well to a 100-150shot of nitrous. Anything much beyond these limits will require a forged bottom end.

[1990gtguy]

yea i figured that about the internals but didnt know that about the block thats pretty sweet. great guys thanks

[Crazystang89]

Other than the labor, a rebuild shouldn't cost too much. They have the forged crank, all you need is pistons and rods if you want big power. Boltons should get you around 320 at the wheels will put around a 12.7-12.9 depending on traction and your driving. Am I'm not sure what it is but the automatic Machs had some differences from the stick shift I believe.

[1990gtguy]

yea im really leaning towards the mach 1 what about a s197 gt

[racin366]

I would get the Mach 1, but I also prefer the old body style. Though to be honest, the 05+ have a lot of good points to them and respond very well to mods.