1. People replace the valve regularly; I'd replace the grommet too. They get brittle from heat and cause the valve not to seal - which causes a vacuum leak and reduces the effectiveness of the system. If you're gonna change the seal anyway, I'd go ahead and do that before I messed with anything else and see if it's actually a bad seal.
  2. I just looked more closely Ray - your a/f looks to be just over 13 - that's PERFECT for peak power, and not too lean for a naturally aspirated set up. Why do you want to change it? If you richen it up, you'll likely lose peak power. You might pick up a bit down in the 3-4 k range - but it's gonna take a chip/tuner/tweecer to make the kind of changes you need to in order to just affect that part of the curve.
  3. Something else has got to be wrong Ray - if you really have 120 psi. 24's are PLENTY of injector to support 270 rwhp - not even close to being maxed out at the 40 psi stock pressure.

    I keep coming back to the maf - something's got to be wrong with the calibration....
  4. Im making that kind of power on 19# Explorer injectors @ 42# pressure.