Jarhead2269

So I was thinking of dropping a cobra engine into my 02 GT but I heard that you have to mess with your computer and other things. How hard is that? Would it just be easier to drop in a 5.4l 2v with a tune? I'm new (hence newbie) so I'm not really sure what goes into a engine swap other then taking one out and putting another in

Sxynerd

Just do the 4v... It's cheaper and easier.

35thAnni99GT

Just buy my GT. It's already been done and the only thing you need to make 1000+ hp is a return style fuel system.

Jarhead2269

Yeah right. I still owe on mine as it is. Besides I'd rather start from scratch and see my baby grow. Why would the 4v be easier? I heard you had to do more work cuz the only difference wit the 5.4l is that the cylinders are bored bigger? Just tryin to learn more, not question your knowledge

35thAnni99GT

I believe the difference between the 331 and the 281 is mainly stroke but also partly bore. It's a known fact that the 331's have a ton more power below the curve, but it's also a challenge getting one to fit inside an engine bay designed for the deck height for a 4.6. The main issue I see you having is finding an intake to work with that won't hamper high end power, but still give good low end and still have it fit underneath anything smaller than a 3 inch cowl hood. Keep in mind as well that the increased width of the motor makes it so you have to modify your midpipe and using longtubes is a challenge without having a tubular k-member in place.

A 4v is a bit easier as it's as easy as dropping in a motor, changing a few pins around on the wiring harness and plugging everything back in. You mentioned something about a cobra motor as well. If you aren't looking at an 03/04 Cobra motor, you're still hampered by the fact that you have the same weak rods that come in the GT's so it really isn't much of an improvement. You may be able to make power easier, but you still have the same ceiling.

PS - A guy that buys his car earns no less respect than one who built it or paid someone else to build it in my eyes.

silverstang1996

4v, for all the reasons everyone else said, and they are faster.
35thanni99GT, do you have your car completely built, like tranny, rear end and such? No offense meant but if not then you really couldn't make it a reliable 1000+hp car with just a different fuel system

SVTeeshirt

umm why not 5.4L 4v

72MachOne99GT

I give respect in the following order..

Bought it, did all the work themselves
Bought it, shipped work out
Bought it done...

now, having said that..

I know #3 is usually teh cheapest, and most of us cant do #1, some of us cant afford #2
and i'd be happy with any of the above :-)

35thAnni99GT

I doubt guys with 1000+hp are worrying too much about reliability as most of them are only running them full out for 8-9 seconds at a time, but for argument's sake, I could make 1000hp for small bursts of time with a big enough shot.

Will it do it, yes. Reliably, no.

Put it this way, if I wanted to make 1000hp the transmission/rear end aren't holding it back. I'm speaking in terms of "supporting" mods. The motor is capable of it with the right poweradder(s), but the current fuel setup won't support it.

Ehmark

The 5.4 has the same bore as a 4.6 just much more of it.