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the pump is a Holley 12- 903, which is a walbro 255. not the high pressure walbro unit though.
the chart for this pump shows 35gph at 75psi, which is 6lbs for a gallon of gas times 35gmh = 210 lbs of gas per hour, which should be about 400 hp.
the chart for these injectors show 450cc at 45psi, and 560cc at 75psi, which is 53lbs per hour at 75psi.
53lbs per hour times 4 injectors equals 212 lbs fuel which is about 400 horsepower. but im no where near 400 hp. i doubt if im 300 hp.
my a/f is about 11.7, and the fuel pressure is maintained at the top end with 15 lbs boost.
not sure on the duty cycle, but the pc3 is +25%. i will have to go make a pull and see what it is, but with the stock injectors, about 31lb per hour, the duty cycle was +80% to maintain a good a/f.
am i not burning all the fuel with a stock ignition system, because im thinking i should be only running about 50psi fuel pressure with these injectors at 15 lbs boost to obtain about 270hp.
my plugs were gapped at .022", but i changed to low resistance wires and am now running .032" without missing under boost.
thanx again, pat