- Nov 11, 2008
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I know I would have to swap out the wiring harness but other then that how hard would it be to swap a 351w into a 98 4.6 gt?
98 4.6 to 351w ?
- Thread starter Black90coupe
- Start date
BlackVert
15 Year Member
you need a new k-member too ... the motor mounts are different
someone else will have to chime in about whether the gauges will work with the older style computer
it's probably easier if you carb it, then you don't have to mess with the harness at all
or better yet, buy mine ... it is already converted, has a new paint job, and is getting new seat covers soon
someone else will have to chime in about whether the gauges will work with the older style computer
it's probably easier if you carb it, then you don't have to mess with the harness at all
or better yet, buy mine ... it is already converted, has a new paint job, and is getting new seat covers soon
nmcgrawj
Advanced Member
it can be done but like others have said your pretty much going to have to start from scratch. it would be easier to do it carbed as you won't have to worry about the wiring harness. realistically it would be easier to get a 5.4 and put that in.
- Nov 11, 2008
- 8
- 0
- 0
Couldn't he get a ton more power from a DOHC 5.4? I mean..Upgrade 4 cams compared to only 1 cam in a 5.8 and rock out? hm...looks like it cost the guy $12k to get 400rw..he got it up to 600rw..but I guess after even more $$?
http://forums.corral.net/forums/showthread.php?t=10896
"The 99 engine bay is the same size as 96 -98 cars,
no problem removing spark plugs..same as cobra
valve covers are not coming off,I don't see this as a big deal.If there is a problem under a valve cover the engine must come out anyway.
Base engine..2000 navigator dohc.
Manley billet rods.
custom je pistons.
reground navigator cams..custom profile.
Valves..I made them from ferrea blanks.
Motorcycle springs and titanium retainers.
extensively ported heads.
42# UPR injectors
Stock cobra throttle body.80mm pro m mass air.
The navigator had 8 rib damper and tensioner,I converted the rest(ac,ps,alt to 8 rib.
Stock cobra exh.manifolds,custom X and stock cobra cat back(real quiet) Made the same power as three chamber flomasters(too loud)
It bolts right up to the stock mounts.
No changes to chassis.
**CONTAINS NO CANADIAN AFTERMARKET PARTS**
With only 400 mi on eng.It made 398 rwhp at 7000 and was still climbing.With 93 octane we had to retard the timing 5 degrees and run a rich a/f to keep it from detonating,Now With four gallons of 110 cam 2 in the tank and timing up 6 degrees it picked up a bunch ,I want a rematch with the dyno soon.
I try to keep it under 7000,It's been 7500 a few times.The piston speed at that rpm would make you puke!
Cost..About $12,000 parts only, as far as labor..I have to give that a lot of thought,Since i did the work..What do i charge myself?
Do i regret not building a windsor,Or a blown 4.6...The only reason i started playing with mustangs is because of the 4V engines,I have been racing and winning for years with 4V prostock bikes,The technology makes 2V stuff seem like stone age stuff,I like N/A engines,The 5.4 looked like the answer..cross bolted mains.nice forged crank,big stroke(torque)4V heads(low stress valve train,High rpm potential..It turned out better than i could hope for..It is very rev happy,yet you can pull it down to 1200 in fourth and pull away with out a down shift.,around 5200 it hits like a 125 shot.
Intake manifold It is a national passtime trying to modify 4.6 cobra manifolds to improve them..If the cobra manifold can't feed a 4.6 Why would you think it can support a engine with 50 more cubic inches?There was no alternative but to build a manifold to complement the rest of the package.
Hope to post new pics soon..Al
__________________
5.4 N/A Cobra, 593 rwhp.
http://www.mustang50magazine.com/fea...420/index.html
http://www.musclemustangfastfords.co...0405mm_4valve/
Video..http://www.musclemustangfastfords.co...e_01stream.mov
Boss330Racing.com
http://musclemustangfastfords.com/ev...p_051100_shot/
http://www.musclemustangfastfords.co...bra/index.html
Home of the 2004 NMRA Factory stock national champion.
ModularFox.com"
http://forums.corral.net/forums/showthread.php?t=10896
"The 99 engine bay is the same size as 96 -98 cars,
no problem removing spark plugs..same as cobra
valve covers are not coming off,I don't see this as a big deal.If there is a problem under a valve cover the engine must come out anyway.
Base engine..2000 navigator dohc.
Manley billet rods.
custom je pistons.
reground navigator cams..custom profile.
Valves..I made them from ferrea blanks.
Motorcycle springs and titanium retainers.
extensively ported heads.
42# UPR injectors
Stock cobra throttle body.80mm pro m mass air.
The navigator had 8 rib damper and tensioner,I converted the rest(ac,ps,alt to 8 rib.
Stock cobra exh.manifolds,custom X and stock cobra cat back(real quiet) Made the same power as three chamber flomasters(too loud)
It bolts right up to the stock mounts.
No changes to chassis.
**CONTAINS NO CANADIAN AFTERMARKET PARTS**
With only 400 mi on eng.It made 398 rwhp at 7000 and was still climbing.With 93 octane we had to retard the timing 5 degrees and run a rich a/f to keep it from detonating,Now With four gallons of 110 cam 2 in the tank and timing up 6 degrees it picked up a bunch ,I want a rematch with the dyno soon.
I try to keep it under 7000,It's been 7500 a few times.The piston speed at that rpm would make you puke!
Cost..About $12,000 parts only, as far as labor..I have to give that a lot of thought,Since i did the work..What do i charge myself?
Do i regret not building a windsor,Or a blown 4.6...The only reason i started playing with mustangs is because of the 4V engines,I have been racing and winning for years with 4V prostock bikes,The technology makes 2V stuff seem like stone age stuff,I like N/A engines,The 5.4 looked like the answer..cross bolted mains.nice forged crank,big stroke(torque)4V heads(low stress valve train,High rpm potential..It turned out better than i could hope for..It is very rev happy,yet you can pull it down to 1200 in fourth and pull away with out a down shift.,around 5200 it hits like a 125 shot.
Intake manifold It is a national passtime trying to modify 4.6 cobra manifolds to improve them..If the cobra manifold can't feed a 4.6 Why would you think it can support a engine with 50 more cubic inches?There was no alternative but to build a manifold to complement the rest of the package.
Hope to post new pics soon..Al
__________________
5.4 N/A Cobra, 593 rwhp.
http://www.mustang50magazine.com/fea...420/index.html
http://www.musclemustangfastfords.co...0405mm_4valve/
Video..http://www.musclemustangfastfords.co...e_01stream.mov
Boss330Racing.com
http://musclemustangfastfords.com/ev...p_051100_shot/
http://www.musclemustangfastfords.co...bra/index.html
Home of the 2004 NMRA Factory stock national champion.
ModularFox.com"
99FiveOh
15 Year Member
If your car was a V6 it'd be a breeze to swap over. But as it stands you'd have to replace the hydroboost with the standard booster setup. Are 96-98's returnless fuel systems? If so you'll have to convert it to a return style.
I've done a V6 to 5.0 in a 97 Mustang before and it was easy. If we were putting a 351W in the car it would've been the same really, we'd have just gotten a different engine setup to begin with.
I say sell your car, go buy a really clean V6 (maybe with a blown motor, see those on craigslist all the time for less than 1500 bucks!) and drop your 351 into it.
I've done a V6 to 5.0 in a 97 Mustang before and it was easy. If we were putting a 351W in the car it would've been the same really, we'd have just gotten a different engine setup to begin with.
I say sell your car, go buy a really clean V6 (maybe with a blown motor, see those on craigslist all the time for less than 1500 bucks!) and drop your 351 into it.
The 5.4 2v is a torque monster which makes it very fun to cruise around town, but it's definitely lacking on the top end. If you want something that'll put up good track times you'd be better off with a 4v 4.6 or 5.4....Or you could just add a blower.
These threads should help you out.
http://forums.stangnet.com/718631-my-weekend-project-2000-gt-5-4l-swap.html
http://forums.stangnet.com/746605-2000-gt-5-4l-swap-part-2-a.html
http://forums.stangnet.com/750376-2000-gt-5-4l-dyno-results.html
The_Mustang, I know Ford switched to returnless fuel systems on the 98 Cobra's and all models in 99....I'm not sure if the 98 GT's had a returnless system or not.
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