Trill Gear Head

It all comes down to research. You can find nice take out engines and the subsequent parts from junk yards for a decent price. My current 4.0 is one from a junkyard that had 12,000 miles on it.

For example, this is a take out 4.6 engine with all the accessories

http://karkraft.com/new_used_engines.htm

Hufenstang

brenspeed (sponsor on these forums) has sold take off gt motors with 10 miles on them for 2 grand before, they arent that hard to come by for a reasonable price if you look around like Trill gear head is saying.

edit: found one for a reasonable price

2008 4.6 3valve Mustang GT Engine

318 miles!

complete with clutch and flywheel and all accessories including A/C, P.S, Alternator, harness to firewall, exhaust manifolds and fuel injection with throttle body!

$1995.00

Avalanch3

Just trade in the 4.0 and buy a used GT..

kngdaka

^end of thread

07 Stang

It would be better if your brother sold his 4.0 and bought a GT. There are good deals out there on used S197s that are still under warranty.
By converting the 4.0 you will not have Ford's back on your side if something goes wrong. It would totally void the warranty.

28HopUp

Good advice so far. It is far easier to bolt on an x-charger than swap the motor to a V8. That being said, as time goes on you will see more and more motor swaps with the S197. The car is solid, nice looking, and has a strong aftermarket. In 5 years these V6's will be dirt cheap. Folks who can turn a wrench will be dropping in 5.4L-3v motors from the F-150 and be able to run 12's N/A with that. Eco-Boost 3.5L's will also be a likely motor for a swap. Look how many 2.3L Fox Mustangs are being rebuilt now with powerful V8's. The same will happen with the V6 S197.

Black Mamba GTT

Just buy a GT if you want a V8 unless you are putting a 5.4 in then it's really not worth it. Why try to justify it, the answer is obvious.

rygenstormlocke

You can boost a 4.0 reliably as a DD. You just have to be smart about it. You can also do a motor swap too if you do your homework. Both approaches work, and can be done properly. It's all about your preference.

StreamlineStang

This may be a stupid question but are the 5.4 engines out of the F150 the same as the Mustang? Or what's the difference? Thanks guys.

28HopUp

There are three basic 5.4L motors:
- 5.4L-2 valve (older truck motor)
- 5.4L-3v (current F-150 motor)
- 5.4L-4v (Shelby GT500 motor)

There's also a 5.4L-4v as used in the Ford GT that is different from the one used in the GT500. That list also does not consider any crate motors available through Ford Motorsports, or the 351cid motors from older Fords.