2004 GT Engine Rebuild - Mustang Evolution

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Old 01-12-2015, 04:20 PM   #1
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2004 GT Engine Rebuild

I am planning on getting 600-700 hp and I need to rebuild the engine to stand this power. Is there any website I can find forged parts like cams rods and Pistons? I also welcome any help or recommendations for my project.

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Old 01-12-2015, 04:26 PM   #2
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Are you using the 04 GT 2 valve PI motor?

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Old 01-12-2015, 04:35 PM   #3
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Whatever the stock gt motor is


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Old 01-12-2015, 05:01 PM   #4
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Then you have the PI 4.6 2v motor

Try looking at MMR's website for mustangs
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Old 01-12-2015, 05:04 PM   #5
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Ok. I'll try takin a look at that


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Old 01-12-2015, 05:43 PM   #6
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What does PI mean?


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Old 01-12-2015, 06:15 PM   #7
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PI - mean performance Improvement
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Old 01-12-2015, 06:22 PM   #8
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What does PI mean?


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PI is a generation of modular engines built by ford that are "Performance Increased" versions of the old engines.

Ford had been using the 4.6 2 valve (2 valves per cylinder) engine in mustangs since 1996, but the re-vamped the engines for the 1999 model year. They gained something like 30-40 horsepower with this upgrade, and kept it that way through 2004. Basically, the heads flow better, they have a better intake, and the exhaust is better than the 1996-1998 cars. You can replace the non pi engine with the PI engine pretty easily and they are basically identical to the untrained eye

Fords "modular" engine line refers to their 4.6 and 5.4 liter engines. They had everything from 2 valve per cylinder, 3 valve per cylinder, 4 valves, naturally aspirated, and supercharged combinations. They put them in everything from Crown vic cop cars, grand marquis, ford explorers, mustangs, expeditions, trucks and whatever
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Old 01-12-2015, 06:53 PM   #9
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You can get that power out of that engine but it will be expensive. You won't get that power with out force induction. I almost bought a 04 gt and was going to build it. For yours I'd recommend this
01 bullitt intake (better flow than stock intake and can handle force induction better)
Big injectors
Blow by racing stage 3 cam kit (you need to port the heads for the cams to work, ported heads also increases the power)
Long tubes (good quality)
You could do a cat delete but make sure your O2 sensors are put back in the exhaust or your check engine light will be on and won't go off
X or h pipe with high flow mufflers or no mufflers
Forged internals are a must
For force induction a centrifugal supercharger will do fine at maybe 10-15lbs of boost should get you 700hp with the right tune but forewarning gas mileage will be crap. You should look into getting an inter cooler that kind of boost its highly recommended and to the point of being a necessity.
You could try a turbo but it will need to be maybe a 78mm or bigger.
Your trans won't take that kind of power so it will need to be built. Radials might be a good idea, and stouter axels.
Brake upgrade are DEFINITELY a must (your stock brakes with that kind of power will get you killed)


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Old 01-12-2015, 08:29 PM   #10
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Just weld a turbo in the middle of your exhaust, run some PVC up to the throttle body for a charge pipe, and spray a 150 shot. You will be Fiiine
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Old 01-12-2015, 09:37 PM   #11
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Just weld a turbo in the middle of your exhaust, run some PVC up to the throttle body for a charge pipe, and spray a 150 shot. You will be Fiiine

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Old 01-12-2015, 10:46 PM   #12
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Originally Posted by The Great Recon View Post
You can get that power out of that engine but it will be expensive. You won't get that power with out force induction. I almost bought a 04 gt and was going to build it. For yours I'd recommend this
01 bullitt intake (better flow than stock intake and can handle force induction better)
Big injectors
Blow by racing stage 3 cam kit (you need to port the heads for the cams to work, ported heads also increases the power)
Long tubes (good quality)
You could do a cat delete but make sure your O2 sensors are put back in the exhaust or your check engine light will be on and won't go off
X or h pipe with high flow mufflers or no mufflers
Forged internals are a must
For force induction a centrifugal supercharger will do fine at maybe 10-15lbs of boost should get you 700hp with the right tune but forewarning gas mileage will be crap. You should look into getting an inter cooler that kind of boost its highly recommended and to the point of being a necessity.
You could try a turbo but it will need to be maybe a 78mm or bigger.
Your trans won't take that kind of power so it will need to be built. Radials might be a good idea, and stouter axels.
Brake upgrade are DEFINITELY a must (your stock brakes with that kind of power will get you killed)


Proud owner of:
1965 Chevrolet Impala SS pure original 327 300hp,360ftlbs Muncie 21 4spd, 12 bolt rear, mist blue white interior, 17in cragar thrust wheels, super 44 flow master mufflers. status: 98% restored

2008 Roush 427R #528 All stock except Roush billet grille, Roush CAI 460hp, 425ftlbs, 5spd vista blue white graphics black leather with blue inserts, stock Roush wheels and exhaust. Status: waiting for many many upgrades

70 Dodge Challenger T/A 340 Six Pack 290hp factory rated (bull****) 4spd hemi Orange black interior rallye wheels, T/A exhaust. status: restoration in progress

75 MGB convertible 1.8L 90hp, of pure evil, 4spd Mars red (VW color) black top black interior wire wheels. Status: restored and for sale

Hunting for a black 03 terminator 10th anniversary coupe

Well I was definitely planning to turbo it. That should get me to around 475-500 hp. Then other small things would get me the rest of the way there. Your list of parts is great. Do you know of any websites that have a good selection of these engine rebuild kind of parts?


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Old 01-12-2015, 10:52 PM   #13
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How many miles on the car and/or engine? And I get all my stuff from blow by racing, they are really nice and knowledgeable about building mustangs. They offer everything I listed. If I got this 04 gt I was going to build a badass N/A 2v and basically my N/A build is what is recommended for force induction. Here some pics of that car.Click image for larger version

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ID:	173456


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Old 01-12-2015, 11:23 PM   #14
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Originally Posted by The Great Recon View Post
How many miles on the car and/or engine? And I get all my stuff from blow by racing, they are really nice and knowledgeable about building mustangs. They offer everything I listed. If I got this 04 gt I was going to build a badass N/A 2v and basically my N/A build is what is recommended for force induction. Here some pics of that car.Attachment 173454Attachment 173455Attachment 173456


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Damn that interior looks a lot better than my black leather for sure. N/A still works on 2Vs, people just will point out that its harder. I say go for it. N/A is as real as it gets just make sure it idles lopey as possible lol
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Old 01-12-2015, 11:31 PM   #15
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Damn that interior looks a lot better than my black leather for sure. N/A still works on 2Vs, people just will point out that its harder. I say go for it. N/A is as real as it gets just make sure it idles lopey as possible lol

I hate to tell you that car has 176k miles and the f***ed up part is it drives better than my Roush. I personally work on this car and it's pretty stout for what he's already done to it. I believe has making around 315hp on very minor mods. Honestly I couldn't believe it drove as smooth as it did for that many miles. Power was excellent, steering very even, clutch was great I should've bought it.


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Old 01-12-2015, 11:37 PM   #16
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That's a ton of miles to still drive that well. What all does he have done to it for that power if you don't mind me asking? I'm going to be doing a PI swap possibly with upgraded cams this spring and still looking for some ideas on the set up I want.

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Old 01-12-2015, 11:45 PM   #17
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I did all the mods to it myself. He's a good customer of the shop I work at.
Upgrade chip (best chip avail. at time of purchase, chip already came with a tune)
K&N air filter (not CAI)
Cat delete
Custom h pipe I made
Flowmasters mounted behind axels
Custom bent exhaust pipe (2 1/2in)
Short throw shifter
And it's one of the best sounding 2v and mustangs I've heard.


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Old 01-13-2015, 10:26 AM   #18
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Wow that is a great amount of power from those mods, impressive. Maybe a good Monday motor as well? Thanks for the info

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Old 01-13-2015, 05:42 PM   #19
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Ull never get 700 hp from a 2v n.a at max ive seen was 380 and that was way more money spent then should have he coulda had 800 whp turbo car for the cost, id check out mmr and mhs for parts/ info ( mhs site has some really good info on the site to check out)


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Old 01-13-2015, 06:13 PM   #20
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MHS. Check them out that is great advice. Useful info on their site and they will have the kind of parts your looking for. the money you will spend trying to achieve 700 hp you could buy a 11-12 coyote and then mod that for more ponies.

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Old 01-13-2015, 10:18 PM   #21
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Funny thing is I saw a built 01 bullitt with a centrifugal supercharger making 700hp and its for sale.




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Old 01-14-2015, 03:41 AM   #22
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2004 GT Engine Rebuild

Mmr has better pricing on the forged piston/rod combos and head porting if u want ur stock heads ported ( u have to send them in then wait) mhs has better pricing on there heads if u dont wanna send urs in first u basicly swap them for a pair of ported heads, mhs is also where id get my cams due to there research and selection and they also have a neat cam degree service if u dont have the tools/know how to degree ur cams properly, what ima do when i go to do my lower end is buy those parts from mmr and buy the top end stuff from mhs ( u save a few thousand doing it this way providing u know how to build a motor) if not mmr has good full forged shortblocks/longblocks , just check out mhs and mmr and do your own pricing and see what ur comfortable doing and what you have the budget for because once u reach a certain point it would be cheaper to swap in a coyote or a Ls motor but if 400-550 whp is all u want then a vortech kit with some forged rods/pistons will do u just fine to keep it reliable and be able to beat on it (450 is MAX id take the stock motor to and wouldnt beat on it much at that power )


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