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Hey guys,
I'm new here and not very familiar with Mustangs, so if I'm posting this in the wrong area, go ahead and move it mods =]
Anyway, I'm trying to get this info for my cousin. I searched the forums, but didn't come up with exactly the same swap he's going to do. And since I'm unfamiliar with stangs, I don't know what years, motors, trannys, etc. are compatible.
So, he has a 2003 3.8L MTX, and he has an '86 5.0L (in awesome condition btw, Ford makes some tough *** motors!) and wants to swap in the 5.0. He's a very good backyard mechanic, he's pulled motors, trannys, suspensions, etc. We know the tranny will mount right up because his '03 has the same one as the original the 5.0 is from (the T5 MTX).
I'm thinking all we'll need is the wire harness info, what to splice, wiring up the sensors right, and any PCM issues we might encounter. The '03 does not have a chipped key, so we're not worried about getting a dealership flash.
If someone could provide me this info and any other we might need, or link me to a relevant write up, we'd much appreciate it. Keep rollin' 'stangers!

NYstang

sell the 03, buy a foxbody.

for that engine, you will need new motormounts, radiator, transmission bellhousing, suspension, all wiring for the engine, the gauges will have to be redone since it wont be compatible, etc. more then its worth for a 15hp gain over stock.

LilRoush

So the '03 doesn't have PATS (No chipped key)??

Alex, don't forget other than a complete waste of time for 15 hp (and you are being nice with that, I would have said equal or LESS due to motor wear and tear LOL), it's also not street legal because it's an older motor going into a newer car. (Thank the EPA for that.)

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Right on guys, thanks for the info. I don't think he'll be too disappointed though, he was skeptical of whether the cost and labor would be worth it for the old 5.0 compared to beefing up his v6. I'm sure once I tell him it's only ~15hp difference, he'll have his mind made up. Thanks again.