[mattrotten]

Ok ppl Id like ur opinions on this 1. Eventually Im going 1 of these routes. I know some1s gonna say boost it, but im not really interested in that. whether itd be faster or not. So im thinking of going 5.4 2v with stage 2 cams and valve train, orrrr, a 4.6 4v. Obviously im on a budget, and want best bang for buck. hence the reason i gotta mustang to begin with lol. But I really dnt wanna build a motor, just a simple cam job at most. And I love the torque with my 4.10s with my stock motor, but Im craving more. Im really not considering 5.4 4v bcuz of price so bottom line, 4.6l 4v vs 5.4l 2v.

[termi_GT]

IMO going with a 2v 5.4 you are still going to be restricted by the 2v portion of the swap. Where as in stock form a 4v 4.6 is going to have more potential. But I am kinda partial to a 4 valve.

[WickedSnake00]

I think it depends on what you're looking for.

The 5.4 2v is going to give you a broader torque curve, and more peak torque. It's also somewhat limited by the 2v design (more so than the 4.6 2v), and you'll have to worry about Mustang aftermarket and deal with fitment.

The 4.6 4v is going to be a much better high RPM platform, and has a much larger aftermarket (think Mach 1, Cobra).

So it depends on what you want.

[LGHTNG02GT]

Originally Posted by termi_GT Where as in stock form a 4v 4.6 is going to have more potential. But I am kinda partial to a 4 valve.

i would have to agree

Originally Posted by WickedSnake00 The 4.6 4v is going to be a much better high RPM platform, and has a much larger aftermarket (think Mach 1, Cobra)

couldnt have said it better myself.

for an n/a 4v budget build, i would look around for a c head 4v, some 96-98 cobra intake cams, a good set of LT's and then get it to a good tuner. you should have ZERO problems going over 300rwhp with that and it would be a blast to drive!

[mattrotten]

c heads are off of what year and car?? and whats so special about them over other 4v's?

[WickedSnake00]

Originally Posted by mattrotten c heads are off of what year and car?? and whats so special about them over other 4v's?

C-heads are what they call 99+ revision DOHC heads. They have a large oval port, as opposed to the 98 and earlier DOHC "B" heads which have two ports, and typically have intake manifold runner controls (IMRC's).

The C-heads are a better all-around head, with the 04+ ones being the most desirable due to their 9-thread spark plug holes and coolant revisions. The 03-04 heads come in second, without the coolant revision and 4-thread, and 99-01 in last, with a slightly lower flow rate. (marginal difference between the years at best).

The B-heads have an advantage in the fact they are great at high-RPM's due to their port design, but the IMRC's are tempermental, and performance down low suffers somewhat if you run IMRC deletes.

Ooooor read up on all heads here:
Ford modular SOHC & DOHC tech & specifications

[02gtmustang]

If you go 5.4 go with stage 3 cams its like a stage 2 for the 5.4... You wont have ptv they have more room... 5.4 is just a torque monster compared to a 4.6... ideal thing... 5.4 4v

[DickH]

probably best off going with an 04/05 aviator motor or something like that. Takes more work for the swap as you will have to get cobra/mach parts to finish it, but realistically its better than a 2v 5.4.

[mattrotten]

hmm great info. theres something about "torque monster" that kinda hooked me tho. and i kno ideally a 5.4 4v is the best way but thats gottatake alotta guap to do. IMRC's are kindda like butterflies then? I used to race hondas b4 the stang and my GS-R had what we called "butterflies" in the intake mani. Basically depending on throttle position determined how much the butterflies opened. at partial throttle they were half closed, at full they were wide open. is that the same thing here?

[02gtmustang]

Im in the same boat... I wanna change up my current set up but dont know what to change too... 5.4? 4v 2v? Nitrous or cams... Lol

[MacDizzle]

Your talkin just smackin some 5.4 heads on a 2V? What would happen if I chucked some 5.4 heads on my MMR 4.75? What kind of a setup would that be in contrast to the regular trickflow head and cam swap?

[mattrotten]

Originally Posted by MacDizzle Your talkin just smackin some 5.4 heads on a 2V? What would happen if I chucked some 5.4 heads on my MMR 4.75? What kind of a setup would that be in contrast to the regular trickflow head and cam swap?

No im talkin about either a 5.4 2v block, with original heads, or just use the whole 5.4 motor. or maybe a mach 1 swap

[sharkbait]

Look at my dyno numbers and talk to me about torque monster

[WickedSnake00]

Originally Posted by mattrotten hmm great info. theres something about "torque monster" that kinda hooked me tho. and i kno ideally a 5.4 4v is the best way but thats gottatake alotta guap to do. IMRC's are kindda like butterflies then? I used to race hondas b4 the stang and my GS-R had what we called "butterflies" in the intake mani. Basically depending on throttle position determined how much the butterflies opened. at partial throttle they were half closed, at full they were wide open. is that the same thing here?

Basically the same thing. The Dodge 2.0 Magnum head/intake utilize the same thing. You can do several things with the IMRC's, Cobra computers can control them, you can run an MSD box to control them, or outright delete them.

Originally Posted by sharkbait Look at my dyno numbers and talk to me about torque monster

...the PD blower on it doesn't hurt either.

But there is one aspect I would touch upon regarding the 5.4 vs 4.6. It's the same bore, just different stroke right? Well think about how rough it is for the 2v heads to feed the relatively short stroke of the 4.6. Now you go and put them on a longer stroke motor? You'll be hurting more.

The extra stroke/undersquare nature of the 5.4 does give it a large torque advantage, but it's tougher to get the same flow characteristics of the 4.6. Unless of course you go 4v...

[DickH]

just throwing it out there, 5.4 heads are the same as 4.6 heads when you are talking about 2v or 3v heads. No advantage in using them.

[dhicks7806]

Originally Posted by DickH just throwing it out there, 5.4 heads are the same as 4.6 heads when you are talking about 2v or 3v heads. No advantage in using them.

I thought the 5.4 heads were taller and allowed for more PTV when running a high lift cam...or is it the deck height on the 5.4 block that is higher?


Sent from my Autoguide iPhone app

[sharkbait]

There is no differance in heads between 4.6s and 5.4s.

The cams are the same aswell.

The stroke and deck hieght of a 5.4 is 1 inch higher/longer then a 4.6

[dhicks7806]

Originally Posted by sharkbait There is no differance in heads between 4.6s and 5.4s. The cams are the same aswell. The stroke and deck hieght of a 5.4 is 1 inch higher/longer then a 4.6

Thank you I knew I heard something about that but couldn't remember exactly what it was.


Sent from my Autoguide iPhone app

[mattrotten]

hmm. so really the only advantage would be just alot more torque? is it usable tho? being that its in a van, truck ect the power is obviously not gonna be in high rpms. i do have 4.10s would that keep me out of my power band?? i mean gers are easy 2 change out if doing a swap but im jus sayin

[Scott2001GT]

4v that bitch!