okay, i was getting tired of a certain someone ruining a thread that had some really good information in it.. so i wanted to go through and find the good points and make a new thread... please don't spam this one!! (also a some of some of the 3000+ posted 5.4l swap page)

5.4L SOHC
makes good amount of Hp (around the same as a 4.6L SOHC)
Makes a Crap load of torque 30+ over built 4.6L
is crazy easy and cheap.
PARTS NEEDED:
5.4L (out of a f-150 or like engine)
intake adapter kit (or for better hp/tq HPS intake)
Swap over oil pan,
Modify 2 heater hoses
and need a new front cover and timing kit.
With this you DO NOT need to swap the ECU the stock will work, and you don't need a tune, but it is reconmended.

4.6L DOHC
Makes the decint power to the wheels stock
A decent amount of torque.
more expensive
PARTS NEEDED:
4.6L DOHC engine
you will need to extend you cops
and a couple sensors
if you buy an aviator extra you need
iming cover
coolant crossover
power steering pump position
and also in most cases you will need to buy a new ECU, you can use a stock GT one but it takes work!!

So for money and power go with the 5.4L for a bigger power jump at the start go for the 4.6L DOHC.. and also for FI engine the 5.4L will produce more power due to the longer stroke and you can force more air in (but you will HAVE to forge the 5.4L for any FI)

That is my basic understanding of things... R3D and others that HAVE done the 5.4L swap please correct my information is wrong..
and R3D you don't want this thread because its just a repeat, i just was tired of looking at that the other thread...

 

THANK YOU!!!!!!!!!!!!!!

lol...

people can duke it out in here all they want

 

I would have to agree with all of the above. I'm going 5.4L because I have always been extremely impressed with the Lightning and the response that motor has when aftermarket parts are put on it and best of all swapping the blower for a turbo. So I had a turbo made for the 5.4 bought a 03GT threw it on the 4.6L and blew it up, Now it's time for the 5.4 with a serious bottom end and all the rest of the goodies. My thought was "if that Lightning can pull that hard just think what that amount of torque would do in a car 2000 lbs lighter!"

Just my 2Cents and why im going with the 5.4 and a Turbo.

 

doesent the lightning have a 4valve engine?

i found a Aviator 4.6l 4V on ebay for 1,700...

I guess when it comes to decision time on which route im gonna go, im just gonna haave to see how much my budget is and take a look and see.

i'd rather get the 4v 4.6l to be honest. Buy it, keep it in the garage, get it built up a bit while i trash my 4.6l 2v. lol.

plus, i KNOW my shaker will fit the 4v, while it might be difficult getting it to fit on the 5.4. from what i understand the 5.4 sits a few inches higher.

but damn, 300ftlbs of torque at the wheels on 2200rpm... That has GOTTA be fun

 

The stock GT ECU requires a retune for WOT but will be driveable on the GT tune.

The 4.6 4V will also make more power with FI assuming all variables are optimized for each.

 

lightning has a 2v

 

The world's fastest 2nd gen Lightning is running a 5.4 4V.

 

Isn't the 5.4 4v out of the Navigator

 

as far as i know they just had the 2valves and now have 3v

 

There's several versions of the 5.4 4V, with different cylinder heads, shortblocks, cams, intakes, compression, and so on.

The Navigator, Blackwood, 2000 Cobra R, Ford GT and the Shelby GT500 all had or have 5.4 4Vs. Navigator had it first in '99.

 

FWIW, I did not have to change my coolant lines, was a perfect fit

 

now if it really wasn't an money issue i would say do the 5.4L 4v its the best of both worlds, great and awesome flow, and a bigger displacement!!

 

couldnt agree more, the 5.4 2v I put in mine was just to tide me over until Im done with the 5.4 navi based build. Thats what is so great about the 5.4 2v, its just such a simple swap.

 

would you by any chance know what all has to be done to make a good 5.4L 4v.. and lets say i know you would have to build it, but would you easily be able to make on go up to a cobras red at 6.8K? that would be a really fun engine right there.. and plus if you go and FI it.. wow.. think of the power output you can make!

 

Not sure what you mean by making a good 5.4 4v? I assume you mean one that makes decent power and can be revved to 6800? Id say a good set of rods/pistons, decent cams(after all 6800 in a DOHC engine isnt that high, a certain set of cobra stockers may work) lightly ported heads and a custom intake(unless you got the money for a boss 390)
Id say either a set of b heads or navi or hell about any cobra head with supporting hardware should see 400 to the backs without too much of an issue.
Get crazy with the combo and one in particular has made 590ish to the wheels na. Hard to beat this combo ASSUMING you have the money to do it

 

I'm tempted to throw a set of 03/04 cobra heads on my 5.4, not counting the 2v-4v conversion, they're cheaper than a "good" set of ported 2v heads. I'm talking new, with stock valvetrain, $1820+shipping But then theres the eternal question of an intake.

http://www.latemodelrestoration.com/...tegory=mheads3

 

that's a lot easier to solve than you might think. You can use kar-kraft adapter plates and a NA cobra intake or nix the plates and use a sullivan intake or one of a few others. MM&FF did a big test of them just a couple issues ago. They also have 4v cylinder heads advertised (complete) for <700 a pair.

http://www.karkraft.com/cylinder_heads.htm

You can find some useful head flow data here:
http://users.erols.com/srweiss/tablehdc.htm
Don't take it all as gospel but it's all in line with advertised figures.

 

03/04 Cobra heads will work very well on a 5.4. The Boss 290 Falcons run those heads (along with their own intake and cams) and those cars have broken 400 rwhp with just bolt ons, no engine work.