What year 5.4 for 02 mustang GT swap

[dsmawd350]

Hey guys. I'm trying to help my brother out who's stationed overseas in the navy. He is thinking of doing a 5.4 swap into his 02 GT. He found a guy on craigslist with a 5.4 out of a 97 expedition. will this motor work for the swap? is there a certain year/model motor that is easier to work with when doing this swap? thanks for all the help

[cstreu1026]

This isn't a direct sway and 5.4 is going to require some fabrication and custom headers and/or exhaust. If he really want to go to all the work and expense skip the 2V and go for the 5.4 DOHC navigator engine. That will require an aftermarket intake like the one from sullivan or an expensive imported Aussie 290 Boss intake that will require more modifications. If you do go the 2 valve route the only intake I believe out there is the HPS Harballer.

[rogers]

Yes any 5.4 2v or 4v will work! No exaust isn't that bad just widen your x or h pipe. Hps makes a intake or buy adapter if your looking for swap parts send me a pm and ill get you a guy who's got some parts to do it cheap. Look up mustangboards.com and sign up you'll find all the help you need in those forums. I'm doing a hybrid of a sort with a navi 4v and a terminator upper. The 5.4 from a navi 4v w 2v heads will get you close to 11.1 comp some good cams stage2 or better and that hps intake should get you little over 300 to 350 rwhp and similar torque mid 12's all day and be hella fun on the street =)

[dsmawd350]

im curious why you would source a navigator 4v block and throw 2v heads on it?

[rogers]

A lot of people go after just the heads. There cheap and you get cheap easy high compression. I don't really know what the intended purpose of the car is? But if your like most stang drivers you drive it hard and monsterous torque (something modulars suffer from the lack of) is a lot of fun street light to street light. Topped with all the usual bolt ons most 4.6 guys already have you get something that's fun to drive day in and day out. There's a lot of disscusion around the mustang community over the swap. Throw in a small shot of the spray on the weekend at the track and you get satisfication that's fun beat. And without extra pressure on the engine for a daily it therotically will last longer. Kinda like putting a comon supercharger on a 4.6 2v. My persaonal will see its own build thread on here soon. 5.4 4v and a eaton atleast till I can afford a twin screw... the thought I have is this. We all want a powerful car that's fun to drive and everyone has his own idea of what's best for him my own idea changes from time to time but I'm settled in on the swap, when ford picked the creme del la creme for our pony car where did they turn their attention too? 00 cobra r, gt500, th gt supercar? None of them sport the 4.6 :)

[306Power]

I always thought it was cool to see 5.4s in Stangs, but personally thought for the 300-350 HP it could be made much cheaper and easily with even a 2V 4.6 with a good set of heads/cams/intake, full bolt ons, and even a small shot.

[cstreu1026]

You could do the same thing with a Mk8 or 96-98 Cobra short block and end up a whole lot lighter. An aluminum 4.6 sohc is 80-90 pounds lighter than the cast iron SOHC 4.6and a cast iron 5.4 will tack on another 40 pounds.

You could spend the money from the aftermarket intake and exhaust work needed on a 5.4 swap on a set of new Trick Flow heads and through them on top of an aluminum shortblock with cams and make more than 350 to the wheels and be 120 pounds lighter than if it had a 5.4.

[rogers]

A tubular kmember would be a smart thing to use you could get a inch drop there to bring hood clearence in check. Its hard to meassure complete apples to apples here and its just bench talk but exactly how hard would you have to spin that alum 4.6? And how hard would you have to spin the 5.4? What kinda torque numbers would you see and at what rpm would this happen? I believe that given the basis I don't think we are dealing with a super budget. The 5.4 would be a far better choice no matter how you look at it. The 5.4 is a tough engine it was designed to make a lot of torque down low and do it quick. The problem with any 2v is the cyl heads. Trickflow looks like they got that part together. Heck any 3v is better and 4v's rock. I still think that for price of a used 5.4 some ported heads and slap on all your usual bolt on 4.6 stuff you'd get much greater results more hp and torque at a lot less rpm making it all that much more fun.

[quik lx]

I would like to put a '03 cobra take off eaton on top of a built 2V and make 450HP all day!!!! Guy on F'N Sweet board is making intakes, he's claiming 440 HP on stock/ unported eaton @ just 12PSI.

[cstreu1026]

A tubular kmember would be a smart thing to use you could get a inch drop there to bring hood clearence in check. Its hard to meassure complete apples to apples here and its just bench talk but exactly how hard would you have to spin that alum 4.6? And how hard would you have to spin the 5.4? What kinda torque numbers would you see and at what rpm would this happen? I believe that given the basis I don't think we are dealing with a super budget. The 5.4 would be a far better choice no matter how you look at it. The 5.4 is a tough engine it was designed to make a lot of torque down low and do it quick. The problem with any 2v is the cyl heads. Trickflow looks like they got that part together. Heck any 3v is better and 4v's rock. I still think that for price of a used 5.4 some ported heads and slap on all your usual bolt on 4.6 stuff you'd get much greater results more hp and torque at a lot less rpm making it all that much more fun.

You could do a 3V with bolt-ons and small set of cams and make almost 350 to the wheels...just ask Markcore. I can't really argue with more displacement but I think for the average user who isn't trying to set records the 4.6 is more than adequate...especially when you add boost.

[306Power]

Correct me if Im wrong but the only size or displacemnt difference between the two is the deck height right? That being the case it's the same comparison for a 302 to a 351, parts are cheaper/easier to come by/easier to mod in general for the 4.6 and 302. My dads F150 has the 5.4 4V DOHC and makes 300 HP to the flywheel and 365 lbs of TQ to the flywheel. For under 1 grand you could take a 2V 4.6 and beat the 3V 5.4 out of that truck. Alot cheaper then trying to find a good motor/harness/tranny to put one the mustang. That being said I think it's cool doing something different just think it's not the best dollar per horsepower way to go.

[cstreu1026]

Yup, essentially the only difference is the deck height, but that makes the crank, rods, and possibly the pistons different from the 4.6. the deck height also creates the problems with the exhaust. You can use shorty headers of stock manifolds and alter a stock style mid pipe to fit or spend $1000+ on a custom set of long tube headers. The only real advantage I can see would be the added torque from the bigger displacement. If parts were more readily available and affordable I wouldn't see a problem with the 5.4 but since they are not I would stick with a 4.6.

[rogers]

The engine in question is a 5.4 2v that's all. We all can bench race all day long and argue combos that not what my reply was for. I wanted help w my swap and couldn't find what I needed here. Now some else is looking for help. Its fairly simple and straight forward both are modulars so most not all parts fit. And if you spent 1500 putting in a 5.4 I think most people would be more than satisfied withe the results over tryin to put 1500 into a 4.6 2v. You can't spray it all the time. Supercharger/ turbo charger for less than 1500 complete installed tuned and running good luck. Not saying those deals aren't out there but they are rare. No matter what you build and modify...get a tune but the stock gt tune will make it run... but get a tune if you wanted the most outta your 4.6 2v get a tune. Exaust is simple widen the pipe..done, the intake get adapter plates (band aid) or buy the hps and just use the intake and throttle body you've prob already bought. And get a tune...

[reagan86]

hello, im the guy this thread is over. my brother started this thread to help me out. ive been doing some looking online, mostly at DSS. Im thinking of going with the 5.4 block and im looking at a forged rotating assembly punched out .020 - .030 over. What do you all think of that? Also Ive been thinking of running a higher compression N/A motor to save in the cost of the supercharger. DSS offers pistons in ratios 10.47-1 10.34-1 10.21-2.
So with a good set of cams and heads and higher comp pistions with forged rods and crank, punched out and that cnc block thats supposed to make 35-40hp over stock what kinda #'s do you all think are possible. Thanks for any help.


Deployed onboard USS Nimitz in the Arabian Sea in support of Operation Enduring Freedom

[rogers]

Regan86, checkout mustangboards.com sign up and go to the 4.6 tech you'll find what may be the best 5.4 swap thread around. Its very long. I read the entire thing before I said one word there. There's a lot of help and info. There's also a how to swap and longtubes avail if you want them. A high comp 5.4 2v w the new tricks done right 400 to the tire is possiblewith right cam selection you'll find what you need there. Good luck. Look for my 5.4 4v build thread here soon and I post there regularly. Pm a guy they call r3dn3ck he's helpful!