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I have always for some reason thought that the 3100 had 16# fuel injectors and the 3400 (96-99) had 19# but after looking into this for nearly a whole day (im not kidding   ) I found that 3400swap.com and Accel list the 3100s as 17# and mcgavin has them listed as 17.6# while the only place that has the 3400 listed is 3400swap.com and they say 19#.  I would really like to know the actual ratings so I dont have to pull these things out and flow them.  The 3100 injectors wouldnt be so hard since I have my fuel rail out but the 3400 would be as I dont have any.  Any info is much appreciated.  The part # for the 3400 injector is 17113573 and for the 3100 is 17113572.  they are a whopping one number off.

maybe they offered 2 different kind of injectors over the years of the 3400?  The backyard mechanic in me wants to tell you "who gives a rats *** about one or two pounds difference in rating?"  

My 3400 runs strong on 17lb injectors @80psi that were in the 3100 originally.  I think the 3.1 had 16s.  The 3100 has 17s.  I'm not sure where I got the 17.6 number from.  I always thought they were just 17s.

3400's got the multec II's in 2000+ (along with 3100's) and they flowed more.  Its really not worth your money to upgrade to any stock injector.  Like Mcgavin says, its a very small difference.

You plan on cranking the fuel pressure anyway, so just rely on that for the flow you'll require.

(mcgavinz26 @ Oct. 31 2005,22:07)Q
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EMy 3400 runs strong on 17lb injectors @80psi that were in the 3100 originally.
how much fuel pressure were you able to build with your stock pump?

The life of a stock pump will not last long under constant high pressure.
Minds well upgrade to walbro.