silverstang1996

im looking to buy a complete motor in awhile and have been reading up on a lot of 4v tech but have also heard impressive things about the new 3v motor, hp range im looking for is around 400rwhp, which would be cheaper to do this with?

ben790450

I say 4v

fausty

4 v

04mineralgreyGT

4v would definately be cheaper. Still expensive, but cheaper than a 3v.

ih8chevy

4v
buya mach 1 motor, its the same thing as the 03 cobra motor except non supercharged and its really good
the 3vs are good too but more expensive

dlazrael

4V ftw :-p

PLus 4Vs been around longer, so the performance parts are a little bit cheaper

PushinTheLimit

Close, but not quite. If I'm correct, I dont believe the Mach I 4V has the forged internals that the 03/04 Cobra's have. There is a little differece, but its why the cobra motor can hold up very well into the 600-700 hp range. The Mach is gonna be a lil more limited, but still a very nice motor indeed. I'd still get the Mach I motor... if I didn't plan to supercharge it.

Naturally Aspired------------ 03/04 Mach I 4V
Supercharged------------------ 03/04 Cobra 4V

JJ03MustangGT

machs have a forged crank and that only came on teh 5speeds....the mach also has a higher compression ratio. the 4valve would be a better choice for overall power, but as far as top end work, id go 3v, because you only have 1 cam unlike the DOHC. either would be a better choice than a puny 2v.

blueherd02gt

hmmm I saw a 3v with longtubes o/r h (prochamber) catback, cai, U/D pullies and custom tune with a whipple S/C @ 8psi run 11.21's
Then I saw a 03 cobra with a kenne belle s/c full exhaust run a 11.18........
interesting....later the guy in the s197 said he had 440 whp

ShadowDrake

I know this'll be ignored, but oh well.

The biggest problem with the 2v heads is the flow on the intake side. The exhaust side is great.

The 3v head adds another intake valve, solves this lack of flow on the intake side. While the 4v will still add more power on top of that, due to an extra exhaust valve too, that was never where the problem was to begin with. A 3v will only make 8-15% less power thana 4v with comparable mods on either side.

If you only want 400 RWHP, just keep the 2v and add a blower. There's your cheapest.

PI 2v forged, with stock PI heads, stock PI intake manifold (with aluminum crossover), stock tb/plenum will do too. Add a blower, run 12 psi, and you'll be over 400 RWHP easy. When you decide you want more, just add more boost. You'll look at $3200 or less for the long block/complete engine. $5000ish for the blower, not only will it take you to your target 400RWHP, it will be able to take you much farther (into the 600 RWHP range).

Then again, if you don't want a blower, use nitrous instead and turn that $5000 for a blower into $600 for nitrous.