4.6 / 5.4 Engine Swap ??? - Mustang Evolution

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Old 03-06-2015, 04:45 PM   #1
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4.6 / 5.4 Engine Swap ???

Hi All,
I met a guy the other day that I bought some parts from. He has an 08 Mustang GT exactly like mine...except he's doing some major mods to it. He bought a Crate GT500 5.4 Motor he's putting in the car. He tells me he only had to change the mounts & ECU & everything else was a direct fit. He said the Trans & Drive Shaft all fit from the 4.6. Does this sound right to you guys ???
I'm asking because my motor isn't in the best condition & I'm thinking of doing the same thing.
Anyone who knows anything about this type engine swap would be great to hear from as I'd hate to blow $3500 on a motor & then it not fit like I was told.
Thanks for all replies.
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Old 03-06-2015, 07:37 PM   #2
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Ok sounds fishy, I personally would not bolt up the stock tranny to that engine, that's the only thing I find fishy, other then that it sounds about right. Ecu, engine mounts, fuel pump, trans and driveshaft..


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Old 03-06-2015, 07:40 PM   #3
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The tranny they used was a 6 speed. Any tranny that comes with a modular motor will bolt up to another modular engine, not sure if it could handle it though.

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Old 03-06-2015, 11:19 PM   #4
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I think you could stick with the 5 speed, but Our stock clutch only holds 450ish hp from what I've read, and the gt500s 5.4 makes 500 so it should be upgraded. You'll also have to upgrade the fuel pumps, which are only good up to 400ish I believe. You might be able to get away with a boost a pump, but I'm not sure. I know VMP Tuning sells a gt500 duel fuel pump upgrade kit for our cars, it's like $700. Other than that I agree with everyone else, it should work. Also the gt500 motors are far more than $3500 unless I'm missing something. It won't be a cheap swap.

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Old 03-07-2015, 01:43 AM   #5
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I wont be buying a Crate Motor but one from a wrecked car at the junkyard. They quoted me $3500 - $4000 for a GT500 5.4 motor with under 100K mi.
It's quite a bit more than the $1500 they quoted me for a 2007 4.6 motor with 67 K on it.
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Old 03-07-2015, 08:39 AM   #6
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That's an awesome deal. You have impressive motor hunting skills. Have you contacted anyone else who has successfully done this swap before? They would definitely be able to tell you want you need to do the swap.

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Old 03-07-2015, 08:54 AM   #7
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4.6 / 5.4 Engine Swap ???

Quote:
Originally Posted by Hellish Horse View Post
I wont be buying a Crate Motor but one from a wrecked car at the junkyard. They quoted me $3500 - $4000 for a GT500 5.4 motor with under 100K mi.
It's quite a bit more than the $1500 they quoted me for a 2007 4.6 motor with 67 K on it.

It's a cool idea but I would just get another 4.6 with F/I it will be cheaper and just as fast. That 5.4 is heavy and affects the balance of the car. There are a lot of takeoff parts for sale out there for the 4.6 as a lot of those guys have stepped up to the coyote. Right now is prime time to take advantage of that and do a HOT 4.6 build. Whole lot less trouble and I think the end result will be the same or better.

Edit: If you could find an aluminum block 5.4 for that price it may be worth considering but I think that will prove challenging. I think for your money the 4.6 is the better route unless you got a cheap donor shelby.
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Old 03-07-2015, 03:11 PM   #8
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It's a cool idea but I would just get another 4.6 with F/I it will be cheaper and just as fast. That 5.4 is heavy and affects the balance of the car. There are a lot of takeoff parts for sale out there for the 4.6 as a lot of those guys have stepped up to the coyote. Right now is prime time to take advantage of that and do a HOT 4.6 build. Whole lot less trouble and I think the end result will be the same or better.

Edit: If you could find an aluminum block 5.4 for that price it may be worth considering but I think that will prove challenging. I think for your money the 4.6 is the better route unless you got a cheap donor shelby.
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The aluminum block 5.4 isn't any heavier than the 4.6 it's just stroked. The supercharger adds some weight though


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Old 03-07-2015, 03:28 PM   #9
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The aluminum block 5.4 isn't any heavier than the 4.6 it's just stroked. The supercharger adds some weight though


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I don't see him getting an aluminum block 5.4 for $3500 from a junkyard. Maybe a cast iron block....


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Old 03-07-2015, 05:50 PM   #10
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Yeah Guys....I never even asked about the Block. I am wondering if I could possibly get 500 - 550 H.P. out of a 4.6 with a few mods. I'm not familiar with Modular Motors just yet.
All my previous Mustangs were push rod motors so this is a whole new ball game for me.
I was able to build a 302 / 5.0 motor from advice from others so I think I can build a 4.6 if I just know what it takes to reach my goal.
Which would be the better route to get to that 500 H.P. mark? The GT500 motor or to build a 4.6 ? I should say...which would be the more cost effective way to go ?
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Old 03-07-2015, 07:47 PM   #11
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The general Idea is that a 4.6 Will stand 450rwhp, which close to 500hp at the crank. Unless that last little bit of horsepower means a lot to you, your better off with the 4.6

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Old 03-08-2015, 05:41 AM   #12
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I guess I'm just expecting more from Ford. My 94 GT seemed to be much more aggressive & powerful compared to this 08 GT. I would think after 14 years & a new motor design the car would be much more powerful....but it's not. I expected this car to do stock what my 94 did on a budget build. But the Crank still only handles 450 H.P. just like the 94 5.0.....Sad to me.
So what is Ford's answer to the 707 H.P. Challenger Hellcat & the new Vette & Camaro LS Motors? I don't know what the Shelby's put out...but I haven't ever heard anyone say they've beaten a Hellcat or Vette in one as of yet.
You see...I want my car to look like just another everyday GT but runs more like a Shelby.
Kind of like the Farm Truck from Street Outlaws....a sleeper. I don't expect to beat a vette
but I do want to eat other GT's for breakfast including the 2010-2015 5.0 GT's.
So what will it take to make this 4.6 beat the new 5.0's ????
I think that would be a happy median for me. If I can't make this car beat the 5.0's I need to buy a different motor or a better car.
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Old 03-08-2015, 05:55 AM   #13
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Originally Posted by Hellish Horse View Post
I guess I'm just expecting more from Ford. My 94 GT seemed to be much more aggressive & powerful compared to this 08 GT. I would think after 14 years & a new motor design the car would be much more powerful....but it's not. I expected this car to do stock what my 94 did on a budget build. But the Crank still only handles 450 H.P. just like the 94 5.0.....Sad to me.
So what is Ford's answer to the 707 H.P. Challenger Hellcat & the new Vette & Camaro LS Motors? I don't know what the Shelby's put out...but I haven't ever heard anyone say they've beaten a Hellcat or Vette in one as of yet.
You see...I want my car to look like just another everyday GT but runs more like a Shelby.
Kind of like the Farm Truck from Street Outlaws....a sleeper. I don't expect to beat a vette
but I do want to eat other GT's for breakfast including the 2010-2015 5.0 GT's.
So what will it take to make this 4.6 beat the new 5.0's ????
I think that would be a happy median for me. If I can't make this car beat the 5.0's I need to buy a different motor or a better car.
Can't beat a Hellcat when they all have been recalled


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Old 03-08-2015, 05:56 AM   #14
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I think your expecting too much out of an 8 year old car 300 HP was considered good back then. Times have changed I have an 08 and I have a 12 Boss and there is no comparison between the two. Now if you do some time of F/I setup that will get you in the game. Ford has the GT 500 to compete with those cars you speak of. The GT 500 and those other cars are 69K plus you can't expect a 8 year old 10-12k car to hang with those. I don't know what your intentions are but if max performance is what you want and you have the funds buy a GT500.


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Old 03-08-2015, 06:08 AM   #15
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So...what kind of H.P. does the GT500 motor put out ? I'm really starting to think this might be what I'm looking for as far as power goes. I've only found 1 junkyard out of like 25 that even has a GT500 motor for sale & that was a week ago so it may be sold by now.
Those motors seem hard to find.
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Old 03-08-2015, 06:29 AM   #16
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As far as 300 H.P. being good in 2008...???....the 1970's Hot Rods did that. So there's been no major gains in 38 years ??? Granted there was the gas crisis which made auto manufacturers go economical. But still...a measly 300 H.P. seems like nothing when you think about the Super Bee, Road Runner, Barracuda, GTO, etc... doing that 30 years prior.
I realize these all had bigger motors (426 c.i. & up). But the point is...there's no major increase in a base model in 30 years. From the 94 GT 5.0 238 H.P. to an 08 GT 300 H.P.
isn't much of a gain.
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Old 03-08-2015, 07:11 AM   #17
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2011 was a nice little gain.
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Old 03-08-2015, 07:39 AM   #18
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A 2014 gt500 make 662hp.

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Old 03-08-2015, 08:21 AM   #19
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The GT500 motor sounds great then !!! Now to find out all the details that need to be done to make it work. Hope the junkyard still has the motor. I just wonder how much more the Trans & Drive Shaft will cost. I'll probably need the ECU also. Hopefully, I'll be able to cut a deal. I'll find out Monday.
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Old 03-08-2015, 08:25 AM   #20
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Quote:
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As far as 300 H.P. being good in 2008...???....the 1970's Hot Rods did that. So there's been no major gains in 38 years ??? Granted there was the gas crisis which made auto manufacturers go economical. But still...a measly 300 H.P. seems like nothing when you think about the Super Bee, Road Runner, Barracuda, GTO, etc... doing that 30 years prior.
I realize these all had bigger motors (426 c.i. & up). But the point is...there's no major increase in a base model in 30 years. From the 94 GT 5.0 238 H.P. to an 08 GT 300 H.P.
isn't much of a gain.
They used SAE Gross to measure HP, not SAE Net like today. All those big HP numbers were BS. Look at real dyno results from stock muscle cars back then, not that impressive. What they did have was torque, but its easy to make lots of torque in a large displacement engine.
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Old 03-08-2015, 09:22 AM   #21
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Originally Posted by Hellish Horse View Post
As far as 300 H.P. being good in 2008...???....the 1970's Hot Rods did that. So there's been no major gains in 38 years ??? Granted there was the gas crisis which made auto manufacturers go economical. But still...a measly 300 H.P. seems like nothing when you think about the Super Bee, Road Runner, Barracuda, GTO, etc... doing that 30 years prior.
I realize these all had bigger motors (426 c.i. & up). But the point is...there's no major increase in a base model in 30 years. From the 94 GT 5.0 238 H.P. to an 08 GT 300 H.P.
isn't much of a gain.

The emissions controls is what choked down the horsepower in the 70's more than anything. Those old cars especially not properly tuned put out excessive amounts of pollution. There are pictures of smog so bad in LA in the 70's technology has come a long way since then. Secondly 300 HP is pretty good for a street car and unless your going to the track there is no need for more than 450 RWHP in a street car. Have you felt a true 450 RWHP car? These big numbers people just throw around nowadays unless they show you proof a lot of them are BS. 450 RWHP is enough to get you in the 11's in the 1/4 any faster and you need a roll cage and need to consider building a drag car


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Old 03-08-2015, 09:25 AM   #22
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yeah, the Road Runner I had as a teen sure was a nice car at the time. It wasn't stock though as it was a 426 Wedge & had a Hi Rise Intake with 2 Holley 1150's on it. Don't have any idea what it would dyno at but it sure was fast !!!
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Old 03-08-2015, 09:33 AM   #23
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http://www.superchevy.com/how-to/add...ko-camaro.html
Check these numbers out.

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Old 03-08-2015, 10:02 AM   #24
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A guy on IMBOC did it on a Bullitt, it was very extensive and expensive. Lot more than just dropping the engine in. IIRC he had to put a new harness in, fuel pumps, tranny and driveshaft. Also had access to a dealer to use lifts and tools to make it all easier.
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Old 03-08-2015, 12:21 PM   #25
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Page 3 - Chevrolet Muscle Car Dyno Wars - 1969 L72 Yenko Camaro - Super Chevy Magazine
Check these numbers out.

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This illustrates my point exactly. People get confused with HP and Torque. If its off the line pull and that pushed back in your seat feeling you want more torque/gearing. Your best bet would be to find a used 4.6 block, build it slowly and maybe add a supercharger/ procharger making 7 lbs of boost with a tiny pulley. Then run a waste gate set to 7 psi so you can move the torque curve down in the rpm range. This combined with 3.55 gears would give you a tire shredding combo for MUCH less then a 5.4 swap. Plus you could do it over time while you continue to drive the car With its existing engine.
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Old 03-09-2015, 05:33 PM   #26
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This conversation sounds like my current dilemma.
Option 1 - Give the GT to my daughter in 4 yrs, maybe have the tune dialed back a bit. And, buy a couple year old Shelby for me.
Option 2 - Keep the 2010 GT, pull the badges and put about $10K in the motor/brakes/suspension making it a sleeper. Buy the daughter something a little less imposing.

Hmmmmm.....


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Old 03-09-2015, 05:39 PM   #27
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4.6 / 5.4 Engine Swap ???

Option 1....that's what I did!Click image for larger version

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Except I bought a Boss instead of Shelby
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Old 03-22-2015, 12:26 AM   #28
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I am not sure I would buy a 5.4 with high mileage. You are talking about a Super Charged motor. You have no idea how it was used. If you are going to run it hard your 5sp will not hold up. most low mile gt500 motors cost around $8,000 complete ( S.C, ECM and harness ) You would be better off to buy a new boss 4.6 big bore block with a stroker crankshaft (324 ci) all forged parts and later add forced induction
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