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Old 04-23-2007, 12:27 AM   #1
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4.6 - 5.4 swap

Does anyone know if a a 5.4 modular will bolt in in place of a 4.6 in an '04 Mustang GT?
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Old 04-23-2007, 01:49 AM   #2
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Re: 4.6 - 5.4 swap

not as easy as you think. i too was on the 5.4L/4V swap, but its not an easy task. i dont remember the entire list of parts, but its long. and its not a direct changeover.
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Old 04-23-2007, 08:14 AM   #3
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Re: 4.6 - 5.4 swap

whats the main reason for wanting to do the swap other than saying you have a 5.4L engine. Just wondering if you might be going through the trouble for nothing.
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Old 04-23-2007, 08:15 AM   #4
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Re: 4.6 - 5.4 swap

The swap is worth it for the torque difference if nothing else.

It is a very lengthy and complicated install however. It is a tight fit if you go DOHC...which is the only way I would go.
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Old 04-23-2007, 01:28 PM   #5
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Re: 4.6 - 5.4 swap

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The swap is worth it for the torque difference if nothing else.

It is a very lengthy and complicated install however. It is a tight fit if you go DOHC...which is the only way I would go.
either way i think you need a different hood, i think if you go with the sohc 5.4 the manifold has clearance issues with the stock hood, if you go 4v im sure you will run into the same problem.
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Old 04-23-2007, 01:41 PM   #6
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Re: 4.6 - 5.4 swap

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either way i think you need a different hood, i think if you go with the sohc 5.4 the manifold has clearance issues with the stock hood, if you go 4v im sure you will run into the same problem.
yeah you do a buddy of mine did this swap and ended up buying my old steeda cowl hood off of me
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Old 04-24-2007, 06:35 PM   #7
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Re: 4.6 - 5.4 swap

besides the the usual stuff you will need a different hood, different intake, 4.6 GT intake will not fit, and the truck intakes are not the best for horsepower. Eithet a 4.6 with adapters or custom intake. Custom headers. I think that might be it
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Old 04-24-2007, 06:43 PM   #8
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Re: 4.6 - 5.4 swap

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Originally Posted by lowflyn View Post
The swap is worth it for the torque difference if nothing else.

It is a very lengthy and complicated install however. It is a tight fit if you go DOHC...which is the only way I would go.
+1. Plus if the engine was out already, it would be getting bored and stroked. No point in removing a stock engine to put another stock engine back in.
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Old 10-12-2008, 08:22 PM   #9
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Re: 4.6 - 5.4 swap

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Old 10-12-2008, 09:24 PM   #10
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Re: 4.6 - 5.4 swap

^+1, birdman, ive seen u on mach1regisrty.com and u are one of my heroes lol. i am in the process of the 5.4 swap, i was going sohc, but now dohc because i found all my stuff for cheap. the 2v swap is not as hard as people think, the trannys bolt up and u have to extend some wiring for the 5.4. they make adapter plates for the pi intake to fit on top of the 5.4 and ull need a 8 bolt flywheel and matching clutch. the engine is taller but they make k-member spacers to lower the engine down. ull also have to modify the mid pipe. the 4.6 will not match the 5.4 in torque delivery so that alone is worth the swap. birdman actually has swap kits for the swap. ill actually pm u birdman w/ a few questions about your swap kit.
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Old 10-13-2008, 06:34 AM   #11
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Re: 4.6 - 5.4 swap

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Old 12-12-2008, 06:37 PM   #12
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Re: 4.6 - 5.4 swap

Like a buddy told me lately, If you can put a 427 in a 72 Pinto (which I did), you can put a 5.4 into a Mustang which is made for the same engine family. The 5.4 is the same engine as the 4.6 with just a taller deck, just like the difference between the 5.0L (302) and the 351 windsor. So the block's a little taller and the heads will be a little higher too. Dropping the K member a couple inches and modifying the exaust a little and probably modifying the engine wiring harness are all things that can easily be done.
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Old 12-13-2008, 06:57 AM   #13
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Re: 4.6 - 5.4 swap

a 5.4 2v swap is pretty direct. you will have to get intake adapters or the hps swap intake. the 5.4 will clear the stock hood with minor modification to the hood. no lt header is available, and if you are doing a complete rebuild then you have to buy a few things for the 5.4.
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Old 03-28-2009, 04:00 PM   #14
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Re: 4.6 - 5.4 swap

Another one on the road in Naples, Florida.
Completed a couple of weeks ago in a 98 Cobra.
Motor is very mild.
5.4 32V (01 heads), forged lower end, flat tops, FGT cams,
and the Aussie intake (modded) with the kit.
Vids are poor quality, (sorry)
camera has been acting strange lately.

In process:



Finished product:



Bad quality vids (again, sorry, but the sound does work well)



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Old 04-15-2009, 05:03 PM   #15
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Re: 4.6 - 5.4 swap

hmm I wish i could come across a GT500 setup for my car
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Old 04-15-2009, 06:12 PM   #16
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Re: 4.6 - 5.4 swap

Very Nice Swap!
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Old 04-15-2009, 07:48 PM   #17
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Re: 4.6 - 5.4 swap

looks good birdman, how much better does it feel from the 4.6 motor?
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Old 04-15-2009, 09:15 PM   #18
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Re: 4.6 - 5.4 swap

here is my swap its a 98gt with a 01 5.4 with a vortech V1 Strim charger
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Old 01-21-2010, 07:24 AM   #19
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Re: 4.6 - 5.4 swap









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Old 01-21-2010, 07:25 AM   #20
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Re: 4.6 - 5.4 swap

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