"How-To"

install 42# Ford injectors on the V6 SHO

(also applicable to other injectors)

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If you have a V6 SHO, and are planning on running moderate to high boost, you MUST upgrade the fuel system to supply the motor with enough fuel.

One of the items that must be upgraded, is the fuel injectors.  MTX and ATX SHOs actually use different injectors (MTX = 24#, ATX = 24.4#) , but both are said to be good for nearly 300hp (crank).  If your planning on more than that, plan on upgrading the fuel injectors.

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First and foremost, in order to run larger injectors the stock fuel rails must be modified.  The injector openings must be enlarged (bored) to fit the larger injectors.  The newly enlarged opening must also be chamfered and polished in order to reduce the possibility of damaging the injector O-rings during installation.

Most machine shops can handle this job.  It is relatively straight forward.  Expect to pay anywhere from $30 to $80 for the machine work.

Specifications are as follows:

Ford Racing injectors:  .525 inches

Accel injectors: .550 inches

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Now that you have your fuel rails modified to fit the injectors, you must modify the injectors to fit the SHO!  The stock injector "caps" must be swapped with the new Ford Racing injectors.

First, start with the stock injectors.  Remove the rubber seal and cap, carefully!  because you will be reusing both of these items.

I have heard people mentioning the use of a heat gun to remove the caps.  My method was a little bit less exotic.  I simply grabbed them with a pair of pliers (CAREFULLY!) and wiggled them off.

Now for the Ford Injectors, you must remove the cap, the O-ring and the washer.  These caps proved to be very tough to remove.  I managed to mangle every one getting them off.  But they are not needed, so I didn't feel to bad!

Next you need to install the caps and seals from the stock injectors onto the Ford Racing injectors.

With the way the injectors, fuel rails, and electrical harness assemble together on the motor, the injectors wind up being rotated a bit.  If you look at the stock injector caps, you will notice the orientation.  You must match this angle.  These two holes in the caps direct flow to the intake valves.  Luckily, the angle is the same on all of the 6 injectors.

The final item than needs to be addressed is the rubber spacer. If you take a look at one of the stock injectors, at the end that installs into the fuel rails, you will see a rubber spacer (looks like a wheel).  Unfortunately this item is not large enough to fit the new injectors.  I used a bit of 1/2 rubber hose to make the spacers.  Trimmed to fit properly, they worked great.

Here is a pic that shows the new injector with the rubber hose spacer, installed into the fuel rail.  This spacer is crucial in providing enough pressure against the rubber seal that meets the head of the motor in order to make a good seal.

From here, you can install all the injectors into your modified fuel rails, then install the assembly onto the motor.