[sharkbait]

I cant seem to get my mind off this swap.

So i thought id ask a few questions

Doing a 5.4 4V swap, would it just be like swapping a 4v 4.6 in my car?

Also what intake manifolds are available for the (i think C port) 4v heads.

I also heard the navi heads have a larger intake runner and a smaller exhaust runner due to a coolant passage? Is that true?


Whats the weakest part of a 5.4?

[86er]

You have to run a 5.4 intake, its a wider motor and 4.6 stuff wont fit. Sullivan, hogan and others make intakes for them, they are pricey though 700-1000 dollars new

it does drop in, but with the 4v heads on a 5.4 you will be pushed to the max on space.

the exhaust ports arent that bad, they are one of the better stock flowing heads, even coming on a truck. A little pork work REALLY opens these heads up.

The stock motors are pretty stout, I helped put one together in a 99 car and with 10lbs of boost was a beast, people say they will handle 700-800 stock, but until I see it, Im not gonna jump on that one.

Modified right they will make/handle what ever you want them to make.

I want to build one N/A about 11:1 ported heads, good cams, spin it to 7500 should be good for 500ish at the wheels with nothing radical other than the compression ratio

[sharkbait]

So wait.

your saying the bottom end on that car is stronger then the average 4.6?

[86er]

the car I worked on dynoed 57x but some have said 700-800 it will/can handle. Ive never seen it, does it mean its true or not, I cant say

[sharkbait]

Anyone else had any success with these motor or head of success with these motors?

[86er]

honestly, if you just buy a good intake and throw some good guts inside it, you will make more power than youll know what to do with

[DickH]

the 5.4 dohc is a nice motor when done right, go with a boss290 manifold, 11:1 comp ratio, and some mild cams and you will have a fairly stout NA mod motor.

[sharkbait]

Well going for N/A power is a waste. You can go farther any day with boost.

[86er]

but the piping gets tricker with that motor in your engine bay, 550 will make you shit your pants, esp with what you have now

[sharkbait]

Are there any roots style superchargers for that setup?

[DickH]

if you stick with a 2v 5.4 you can look into a lightning blower.

[sharkbait]

Would a GT500 setup work?

[mustanginky]

I would think so, but it wouldn't be cheap. Better to go wiu a procharger. A pd blower on a 5.4 will not fit under hood, and I know of no one who makes a hood to clear it.

[sharkbait]

Im not too worried about the hood issue.

If worst comes to worst il buy a huge ass cowl hood.

To me the torque of a 5.4+ PD blower = sex.

[superbeef1000]

i just purchased a 5.4 out of 05 f150, any one know if i can drop this in my 02 gt how it is or will i have to change the heads and front dress over to make it all work

[DickH]

if its a 3v, you will have to figure out something with the tb, exhaust manifolds, and something with the cams and it should work.

[superbeef1000]

yeh it is a 3v it came with jba headers and they stick out like beasts , i think ill swap the 2v heads to it so i could use the 270 cams i have on the shelf

[86er]

Originally Posted by superbeef1000 yeh it is a 3v it came with jba headers and they stick out like beasts , i think ill swap the 2v heads to it so i could use the 270 cams i have on the shelf

then why mess with a 3v motor, the heads way out flow the 2v.

The stock 3v 5.4 is my truck hauls ass in a 5000lb truck, only imagine in a mustang

[mustanginky]

Keep the 3v, it's a much better choice than a 2v

[superbeef1000]

i was thinking to swap the heads because i have all these new parts sitting here and they are all for the 2v heads compbehive springs and comp 270 cams and comp ajustable cam gears so on and plus i dont have all the wire harness for the 3v engine