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A member here has done it in a V6 and goes in the 11s with it.
Also, PLstang has put a GT500 mill in his GT but he doesn't log in anymore.
It's been done but you're ain't choosing the path of facility...
Good luck.
I mean it's not a direct swap son.
The electronic hook ups alone are a challenge.
Since you're going with an engine (5.4 3v) that doesn't come in any of the Mustangs you'll have to customize everything...
I have heard that it is possible, but that not the most cost effective way to go about it. Stroking your 4.6 to a 5.0 is the easiest way to increase displacement. Then add a S/C or Turbo. You will spend alot more time and money on getting the 5.4 put in.
It's possible. The intake is the biggest issue.
As far as wiring, use a GT engine wiring harness on the 5.4.
Check out mustangcollective.com for several good threads on doing the swap.
Taking a stock 4.6 and building the motor would be an easier path, and is one I'm looking at doing. Yeah, 5.4's are cheap to get, but getting them in, plus the extra weight, is not that trivial. Still, it might be a route I end up taking as well!
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Mike - 2005 V6 Automatic, 300+ RWHP; 12.79 1/4
Vortech supercharger (SOLD); 180*T-stat; PLX Wideband O2, VEI digital gauges, SOS pillar pod; JBA 9MM wires; Mac LT headers, high flow cats; 8.8 w/3.73s, LPW girdle, alum driveshaft, 3000rpm TC; Steeda UCA, panhard bar, brace; CHE lca's & reloc brackets; Steeda Sport springs, Tokico DSpecs. .. "Sally" is getting "balls" ...forged V8 swap in progress
I couldn't help but consider it after seeing so many V-8 blocks just sitting around waiting for a home.. I need to take a camera to school one of these days. Stroking the 4.6 into a 5.0 sounds cool, but the awe of having a big honkin' 5.4L would be pretty awesome indeed..
bahh.. it was a short lived dream, after reading- I think I'd rather save up for a whipple lol. Still would be nice if everything was laid out and done a million times over again (5.4/s197)
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5.4L swap?
.. "Sally" is getting "balls" ...forged V8 swap in progress 
