5.4 intake on a 4.6...would it work?

dr.cid · May 9, 2008

i'm looking at geting a mustang (99-04 gt) and and i had kind of a side idea of something i could do but i'm not really sure if a 5.4l intake manifold would fit our not. if not then why?

most of my knowledge is on the OHV ford V8's not the mod V8's. thanks alot!

Superhereaux · May 9, 2008

You need an adapter to run a 4.6 intake on a 5.4 so i'd imagine the opposite would hold true as well.

The 5.4 intake on a 4.6 (no one does this in case you're wondering) will make alot less power at a much lower RPM range to be useful, the runners are way too long and the car would run out of breath at 4k, not to mention the fact that it won't clear the stock hood.

BEASTang96 · May 9, 2008

so how would a 4.6 manifold work on a 5.4? just curious

Superhereaux · May 9, 2008

BEASTang96 said:
so how would a 4.6 manifold work on a 5.4? just curious

Superhereaux said:
You need an adapter to run a 4.6 intake on a 5.4

http://www.reichardracing.com/46to54adapter.php

dr.cid · May 9, 2008

well what if you were going to put a lightning supercharger assy. on it?

billfisher · May 9, 2008

he is asking to put a 5.4 intake on a 4.6.

it will never fit. a 5.4 i 1" taller deck and .7" wider per side. its about 1.5" wider intake.

oxfordgt · May 10, 2008

5.8 and 5.0

5.4 and 4.6

Same differences, If you know OHV engines you should then know what can swap between the 2.

BEASTang96 · May 10, 2008

i know you need an adapter, i'm just askin how well would it work

mransr · May 10, 2008

I don't think it will work at all

you can use an adaptor to make something smaller fit something bigger: I.E. 4.6 manifold (smaller) on 5.4 engine (bigger), but it doesn't work the other way around...

I suspect the 5.4 manifold is much too wide to fit into the valley on a 4.6

billfisher · May 11, 2008

besides the 5.4 intake is for torque not hp

the PI 4.6 intake is superior in every other way.

jprovence · May 11, 2008

BEASTang96 said:
i know you need an adapter, i'm just askin how well would it work

IT WON'T FIT AT ALL. THE INTAKE IS WIDER THEN THE HEADS ARE. Try going the other way next time.

BEASTang96 · May 11, 2008

jprovence said:
IT WON'T FIT AT ALL. THE INTAKE IS WIDER THEN THE HEADS ARE. Try going the other way next time.

THATS WHAT I WAS ASKIN!! how would the 4.6 intake work on the 5.4 block??

Gearbanger 101 · May 11, 2008

It won't!

/Thread

jprovence · May 11, 2008

theres adapter plates for the 4.6 intakes on a 5.4. They work well. Cams are required on a 5.4 though just to get it to rev to alteast 6k with any intake.

billfisher · May 12, 2008

in general you will not get a 5.4 2v to breath n/a to 6k. even with huge cam

CTGrey02 · May 12, 2008

I've seen it done before, but it had to be cut and welded back together to fit. This was a lightning intake modified to fit a 4.6 with a whipple. While the person that did it was totally capable of handling that kind of work the average shade tree mechanic should look elsewhere.

twogts4us · May 16, 2008

dr.cid said:
a side idea

Leave the side idea on the side of the road...
Even if you got it to work, you'd lose power. The 4.6L manifold gets criticized often because it's plastic, but honestly, it's a great design. Sure, you could make more power with shorter runners, but you'd sacrifice any bit of torque that the 4.6L makes (which is not enough to begin with).
Props for thinking of new ways to mix and match parts - that's what makes cars fun! This, unfortunately, is just not a feasible swap.
A better swap? The whole 5.4 engine...torque monster. Either that or swap in a 4 valve motor.

68stang351 · May 16, 2008

It won't fit. It's exactly like trying to put a 351W intake on a 302.

deftsound · May 16, 2008

ohv v8's are the same as mod v8's

Gearbanger 101 · May 17, 2008

deftsound said:
ohv v8's are the same as mod v8's

In what way?

5.4 intake on a 4.6...would it work?

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