MU71L4710N

yes. ANY set of heads for a 4.6L will bolt to the 5.4 including TFS heads (obviously the cams as well), and with the adapter plate ANY intake mani for a 4.6 will bolt to the new setup. however...to quote off the link i posted:

If you use the HPS intake then the top end picks up quite a bit and you can see gains of 15-30hp or more. Each engine is different so there's no guarantees but these are numbers that are not uncommon and won't set you up for disappointment. The current record NA that we've been able to find is 340/340 to the tires on ported PI heads. The HPS intake allows better underhood clearance and helps stretch the power band on the 5.4 back out to a useful point. Adapter plates move the injector up higher and fuel no longer sprays unimpeded at the back of the valve. This results in higher fuel consumption and a requirement for a good bit more fuel in the tune. The plates are simply a band-aid that has been superseded by the HPS intake. Adapter plates average about 250-375 bucks depending on which brand you get. The HPS intake is 695 and ADDS on average 20-30hp. When's the last time you were able to make an honest 30hp from a bolt-on part for 400 bucks? Exactly. It's worth it and it's stupid easy to bolt up.

there are multiple reasons to avoid the adapter plates unless funding doesnt allow or you have a 4.6 manifold you are in love with already. the HPS intake was designed for the 5.4L mustang swap, so top end powerband was given unlike low/mid power like a truck manifold does if that was your concern.

^ and yes the GT wiring harness/ECU will work fine for a 4v motor. at most you will have to splice some extra length to a couple wires but its nothing major. if you do a 3v swap things will get a little trickier though. if the 3v 5.4L is the same as the 4.6L you will either need to use the 3v computer to keep the VVT and use the 3v (throttle by wire?) throttle body, or you can keep your 2v computer and use camgear lockouts to block the VVT and you will have to make an adapter plate for a cable driven TB.

erikka.paige

My bigest hope with a new K-member is shed some LB and drop the motor down some and I still have had no luck with PTV answers

Repzard

Forgot about the higher deck height.

LilRoush

I had non PI SVO heads and RPP Eaton blower set up in mind.

Drag Racer Dave

I went to http://www.lunatipower.com/Tech/Pist...ionHeight.aspx and did a quick calculation. It looks like the 5.4 piston sits up about .1112" higher off of the deck.

I would soft spring it to find out what you are going to run into for PV clearance. You may also want to reach out to one of the places that does modular heads and ask them.

EcRuckus

Ive been doing research on this swap for a short period of time. Planning on doing it in my car this summer. My plans...
Need to buy...
5.4 bottom end
5.4 front cover and timing components
10.5" flywheel and clutch( I have heard of someone retro fitting an 11" and quote "It was stupid easy" not sure how tho...
HPS Intake
24lb injectors
Comp 270 cams( the duration of these cams should work well with the stroke of the 5.4

Swapping over from 4.6...
Heads port and polish ( the 5.4 2v heads and 4.6 2v heads are the same. Not sure about other years I know for 03 they are other years shouldnt change)
Sensors, this way the harness is plug and play, still would need a tune obviously
Oil pan ( be sure to bend the fins down otherwise crank hits pan) That is bad
Mounts both motors use the same mounts

Only known issues taller deck height meaning minimum clearance for exhaust mainly on passenger side, if using stock manifold there is a useless nipple like thing at the dowpipe flange shave it off. all other shorty headers should work longtubes are custom only. may update this feel like im forgetting something. feel free to chime in.

Trackstar1319

I am in the process of doing a 5.4 swap right now and I see lots of people recommend the HPS intake over the adapter plates. I can understand switching from the plastic intake to the HPS because of the performance gain. What Im trying to ask is I have a nice intake now and I plan on getting the adapter plates from reichard racing for it. Does the HPS just have some special intake for the 5.4l that adds 20-30 hp or do people just say that because its an upgrade from the stock intake, because I will just stick with mine and get the adapter because its an upgraded intake already.

WannaBeGearHead

You'll be disappointed if you stick with the stock 5.4 intake. I've thought about doing this swap and found that at a minimum you need to get an aftermarket intake for the 5.4. Just with the intake along most people are seeing 260rwhp. Which isn't bad but not worth it IMO

Trackstar1319

Also do the adapter plates hurt the performance? (There only 1 inch) because if that's the case I will just sell my intake and buy the HPS, it will end up costing the same amount as the adapter plates.

Trackstar1319

I don't have a stock 5.4 intake I have my PP intake from my 4.6.