Fox T-Bird/Cougar Forums  

Scott (jcassity) experimented with larger injectors in a CFI - I think it was unsuccessful.

Should I be listing to this or go back to my corner and wire some more?

first off,,,,,,
I did find a 5.0 CFI and the butterfly and bores are much larger than the v6 CFI.  All the pre sefi V8's had this CFI.  However,, there is a third CFI out there and i have yet to secure one. I did see it but it was going out the door when i was walking in the JY office. 
Just find a 5.0 CFi in any configuration,, there are two configurations out there so you just adapt it to your desire.  You will know what i mean when you see one,, hard to explain.  84 Fila has the odd / older configuration im talking about.  He has a couple pics on one of his threads.  That would be the exact one i ended up with.  This CFI was Fords transition from the EEC controlled Carb to eec controlled CFI.  Some externals of the carb/cfi remained and you will need to delete these.

Now,,,,,,,second
If you simply take your existing CFI and remove the butterlies and tps, slide out the linkage, you can use a baby cylinder hone to make the bore ports match up to your intake and egr plate.    The intake and egr are larger than your CFI bore (for some odd reason:mad: ).  Trust me,, the bores on the bottom of the CFI will bore WWWWAAAAAYYYYY bigger,, lots of meat there.
Next up will be to locate and old carb and decide which butterflies you wanna put on. 

Third.......
I did install a 5.0 cfi (no additional bore but what was stock) and swap in blue top injectors.  It ran too rich for my V6.  If you simply find the 5.0 cfi (easy to find) and put in your green tops,, you will notice an ***Very nice**** gain in response.  All you have done is increased air at this point.  If you bore out the bottom half of the CFI and go with larger butterflies it will help even more but at some point your valves/cam are not responding to this benefit due to size/duration time. Finding butterlies should not be hard since you tinker with carbs anyway.

In a nutshell,,
find a 5.0CFI and remove/install your green tops
Dont re-install the injector lower retainer,,, ( have a trick for that and its worked for several years now)
This helps when you wanna just remove injectors and requires no tools.
remove the stock freeze plug from the top of your FPR with a drill
adjust your fuel presure up a half to full turn Clockwise with an allen wrench
non stock FPR's have a plastic plug and no adjustment (from what i can see)
while you have your injectors out , locate a wood/self tap screw
start the screw in the top of the injector gently
give the screw a hard yank with pliers
out will pop the little tiny tear drop screen.
most of the time they are collapsed or black
removing the screens deleted my age old prob of hesitaton
if you feel froggy, install a second inline filter at the fuel feed, i did.