Thinking about a Ford 347 smallblock swap...

Barrier · May 11, 2005

I've got a '99 GT. I figure I dont want a supercharger, as my car's got some good miles on it and I'm afraid it might detonate... plus I'd be starting with 0 miles on a crate. And I can get a Turnkey 347 stroker smallblock for around $3600, question is would the install utterly kill me and want me to throw my car into the river? I'd think it'd be worth the money definitely (theyre talking 410-430 HP, 450 lb-ft torque) but I'd have to fab some custom mounts, possibly a tranny adapter plate (will definitely have to upgrade the tranny anyways) and do quite a bit of other work including the whole exhaust problem But I'm up for a challenge. Anyone done a swap into a newer Stang before? Looking for lurking problems or if I'm just an idiot all around

Thanks in advance

Barrier · May 12, 2005

Bumpage

Roger_4.6_96 · May 12, 2005

You will need to change every wire. New K member, tranny etc... its just not worth it. might as well trade your 99 in for a 94-95 gt and slap 347 in that.

caballo · May 12, 2005

Or just plant a 5.4 in there?!

Tony01GT · May 12, 2005

but how much hp and tq will you make with a 5.4 N/A?

300bhp/ton · May 12, 2005

Barrier said:
I've got a '99 GT. I figure I dont want a supercharger, as my car's got some good miles on it and I'm afraid it might detonate... plus I'd be starting with 0 miles on a crate. And I can get a Turnkey 347 stroker smallblock for around $3600, question is would the install utterly kill me and want me to throw my car into the river? I'd think it'd be worth the money definitely (theyre talking 410-430 HP, 450 lb-ft torque) but I'd have to fab some custom mounts, possibly a tranny adapter plate (will definitely have to upgrade the tranny anyways) and do quite a bit of other work including the whole exhaust problem But I'm up for a challenge. Anyone done a swap into a newer Stang before? Looking for lurking problems or if I'm just an idiot all around

Thanks in advance

check the 4.6 5.0 conversion thread in the 4.6 tech area.

Even though the original platform had the 5.0 there must still be a lot of work, would you be EFI or carb. Either way lots of work as your current ECU runs lots of things from doorlocks & alarm to fueling. You can't just unplug it and hope everything else will work. You would need a whole new ECU setup if fuel injested anyway, so new loom, cooling, plumbing, fuel system may need changing not to mention all of the other mehanical items.

Plus you say about 410bhp from the new engine so with a 5 speed thats probably 350rwhp. With cam and head work I would have thought the 2v 4.6 could produce similar numbers.

I reckon it would make a nice car if done correclty, but it will cost a lot more than just the ticket price of the engine (count on double plus a bit) and at the end of the day may not be as good as it should. Plus the resale value of the car will plumet, by spending $5-6 in engine mods it would more than likely reduce the selling price of the car by a couple of thousand over a totally stock 4.6, crazy isn't it!

But how comfortable would you be buying such a modified one off car, not really knowing whats been done to it, but knowing when something goes wrong it will cost $$$$$$.

Barrier · May 12, 2005

Wouldve been carbeurated, but yeah I see where youre coming from. I also looked into the 5.4L idea a while back but I couldnt find any! Anyone know of a place that sells em?

EDIT: BTW, thanks for that detailed input Mightve just saved me from a sinkhole

300bhp/ton · May 12, 2005

have to say a new GT with a classic push rodder is appealing.

I did a swap in my TR7 from a 2.0 4 cylinder to a Rover V8. Even though the car was designed from the outset for the V8 and the TR8 (American market only) had them it still required lots and lots of work and even more money. Its a real fun little car but still needs things doing to it.

The 4.6 mod engine may not be the best in the world but its really quite a good starting point.

5.4 not sure I think the Navi engine is the main one available.

Personally a supercharged 4.6 is the way to go, lots of power and big block grunt. You could probably rebuild your 4.6 add a blower and run about 450rwhp for less money than a 347 swap.

Barrier · May 12, 2005

Meh, I'm still a bit reluctant on putting a blower on an 85k mile engine... I'd rather have a 0 mile engine than an 85k one with a blower on it wearing down the parts that much quicker...

300bhp/ton · May 12, 2005

all true, although with a rebuild it would be like a new engine anyway.

Keep us posted with what you do.

PS If I was going to swap the engine for a different type I just wouldn't be able to resist a 460ci big block, something like this: http://www.fordcobraengines.com/460_506Horsepower.htm

Mike97gt · May 12, 2005

Barrier said:
I've got a '99 GT. I figure I dont want a supercharger, as my car's got some good miles on it and I'm afraid it might detonate... plus I'd be starting with 0 miles on a crate. And I can get a Turnkey 347 stroker smallblock for around $3600, question is would the install utterly kill me and want me to throw my car into the river? I'd think it'd be worth the money definitely (theyre talking 410-430 HP, 450 lb-ft torque) but I'd have to fab some custom mounts, possibly a tranny adapter plate (will definitely have to upgrade the tranny anyways) and do quite a bit of other work including the whole exhaust problem But I'm up for a challenge. Anyone done a swap into a newer Stang before? Looking for lurking problems or if I'm just an idiot all around

Thanks in advance

i am against the swap and here is why. for one it will be electircal hell too get it running. and the other reason is you will be disapointed with the results.

that motor at 415 hp is rated with no accesories, no emmisions. you will not see that kind of power too the ground. you will probally see around 300 to the ground.. NOT WORTH IT

bdcardinal · May 12, 2005

also depending on where you live, that swap could be highly illegal. i know in CA that wouldnt fly. also if you use a CARB it would be federally illegal since 96+ cars must be fuel injected due to OBD2.

Back2Mustangs · May 12, 2005

MikeZ28 said:
i am against the swap and here is why. for one it will be electircal hell too get it running. and the other reason is you will be disapointed with the results.

that motor at 415 hp is rated with no accesories, no emmisions. you will not see that kind of power too the ground. you will probally see around 300 to the ground.. NOT WORTH IT

You will spend faaaar too much money on that venture for the amount of power you'll get out of it. The way to go is either blower or bottle on a built bottom end... Thats just you're only option for real power. There just isn't an aftermarket for these 4.6's like there was for the beloved 302

Black2001GT · May 12, 2005

300bhp/ton said:
have to say a new GT with a classic push rodder is appealing.

I did a swap in my TR7 from a 2.0 4 cylinder to a Rover V8. Even though the car was designed from the outset for the V8 and the TR8 (American market only) had them it still required lots and lots of work and even more money. Its a real fun little car but still needs things doing to it.

The 4.6 mod engine may not be the best in the world but its really quite a good starting point.

5.4 not sure I think the Navi engine is the main one available.

Personally a supercharged 4.6 is the way to go, lots of power and big block grunt. You could probably rebuild your 4.6 add a blower and run about 450rwhp for less money than a 347 swap.

True, Ford gives us a pretty good starting point with the 4.6L 2Valve. A forged rebuild and a big blower is much more economical than an engine swap.

Barrier · May 12, 2005

How about a 5.4 though? Or is it even possible to get my hands on one...

Mike97gt · May 12, 2005

Barrier said:
How about a 5.4 though? Or is it even possible to get my hands on one...

it's doable. but also a pain for not much gain. i would rebuild your motor and supercharge it.

DropTopPony · May 12, 2005

for the money you were going to spend on the crate motor, get the foxlake 2v stage 2 heads/cams and p-51 intake...thats supposed to be @325-350rwhp. it should put a smile on your face.

Back2Mustangs · May 12, 2005

droptopponynj said:
...thats supposed to be @325-350rwhp. it should put a smile on your face.

And still only minor bolt-on LS1 power. Thats the only thing I miss about F-bodies...the power you get to start with. Too bad the rest of the car is junk after 50K miles.

Thinking about a Ford 347 smallblock swap...

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