Mark Houlahan
Tech Editor, Mustang Monthly
March 9, 2010

Tech | Conversion Wiring Install
For those of us who've been around the block a few times I'm sure you remember hearing about the first 5.0L EFI Mustang engine swap into a classic Mustang. Maybe it was in your favorite magazine, or perhaps you walked by a nice Mustang at a show and had to do a double take when you looked to see what was under the hood. Regardless of where or when you first saw this swap, probably the first question you had in your mind was "how hard was it to do?", followed quickly by "I wonder how much it cost?" Well, depending upon when you saw your first 5.0L EFI engine swap the answers could be "it was a pain in the butt" or "it was as simple as plugging in a few wires." Reason being, early adopters always have it rougher. These fanatics go on a fact-finding mission, tearing into the project with abandon, buying up wiring diagrams and learning how every little subsystem works. So if you saw your first 5.0 EFI swap 15 years ago, it meant it took that owner a lot of trial and error, custom wiring, and fabrication of parts. Today it's mostly a matter of which company do you want to buy your conversion wiring harness from (there are at least four that we know of) and how you'll setup your fuel system. Yes, it has become that easy to install a 5.0L EFI engine into your Mustang or other classic Ford. Hell, there are whole companies that survive off of manufacturing swap parts and doing the conversions.

While the small-block Ford and its EFI dress are still popular, the latest engine swap to gain momentum is the Ford modular engine family. We started seeing these swaps ourselves about six years or so ago and just like the previous early adopters of the 5.0L EFI swap, the modular swappers have had to deal with all sorts of conversion issues, not just the actual fuel injection. Today, once again, there are several companies that offer front suspension kits, engine mounts, and more to fit the modular engine family into a classic chassis. The wiring though has still been pretty much a black art, requiring "dieting" of the late-model donor's harness, flashing the PCM to remove anti-theft and other modern brick walls just to get the engine to start.

There are but a couple of companies that offer conversion wiring or pre-dieted wiring harnesses, mostly for the earlier modular engines with standard throttle bodies. If you wanted to run the newer 4.6L Three-Valve found in the '05 and up Mustang or the supercharged 5.4L Four-Valve found in the current GT500, both with electronic throttle control (ETC), you were pretty much out of luck. Fortunately, Ford Racing has developed just such a wiring kit for those looking for the latest and greatest for their next engine swap.

Ford Racing's two new wiring kits are called Control Packs and were designed, initially, to be offered along with Ford's modular crate engine offerings to provide kit car, street rod, and muscle car builders an easy way to wire these complex engines. Available under PN M-6017-463V ($1,350) for the 4.6L Three-Valve "Hot Rod" crate engine (and '07-'09 production engines as well) and PN M-6017-54SC ($1,999) for the 5.4L Four-Valve crate engine and production '07-'09 GT500 engines, these two harness kits eliminate the hassle of trying to figure out what wire does what and how to connect it all. With a clearly labeled wiring harness and a 15-page instruction manual with color codes, wiring pinouts, and illustrations it allows easy installation and you know your engine will start on the first try. We recently took delivery of the 4.6L Three-Valve Control Pack kit for our '68 Mustang project, which will be powered by an '06 Mustang GT engine. While the actual installation is a few months off, we wanted to tear into the Control Pack kit and get acquainted with it. Check out what's included and know that if you decide to "go modular" Ford Racing has what you need.

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