19lbs should be fine to use.
Injectors are not like Jets in a carb, larger ones in a stock engine don't give any more power, just a lower "duty cycle"(open time), but there is a limit.
The computer for the vehicle is programmed for the fuel pressure and injector size for that vehicle.
Computer knows if it opens a 14lbs injector for 1 millisecond with 35psi fuel pressure it will get XX amount of fuel.
But the computer is also programmed to "learn" and remember changes in the system.
Computer can adjust fuel trims on the fly, opening or closing fuel injectors for longer or shorter times, based on O2 sensor feedback, lean or rich exhaust.
The reason for this learning and remembering is that over time injectors get dirty and fuel pressure may be higher or lower, this changes the fuel flow expected by the computer, so it is adaptive over time.
But............it does have preset limits, if you were to put in 30lbs injectors the open time would be low enough for computer to think something is wrong with the system and it would turn on the CEL(check engine light) and set a code, Rich code, because open time is so low, engine is not running Rich, Lean and Rich codes are strictly about injector open time and computer's preset limits.
I.E. if you have a vacuum leak(bypasses MAF sensor) the computer has to add more fuel than expected, so longer open time for injectors, computer sets Lean code, because injectors need to be open longer than expected, engine is not running Lean, it is all about injectors open time
19lbs shouldn't set any codes, and are probably better for the 3.0l Vulcan engine anyway.
The math for 6 injectors for 150 horse power and 35psi fuel pressure comes out just at 14lbs per hour
So 19lbs would be better IMO, if you are changing them
No you don't have to change anything else
Last edited by RonD; 07-05-2016 at 11:50 AM.