I have O2's on the motor now and it still runs bad. It will rev to about 4,000 rpm for the first minute or so, then as it warms it falls flat. During that first minute I can get about 2/3 throttle response. Any more than that power drops off. After the first minute or so when power decreases it falls rapidly to where it will barely run about idle. I do run lake water for cooling so the engine temp usually never gets above 104 degrees.
I'm running a 5.3 with stock injectors, ported heads that are milled for 10:1 compression with a 226/229 .575/.578 on 112 cam and on a DBW throttle that seems to be working correctly. With the motor not running the throttle blade has full movement.
It's gonna go back on the water Wednesday night for the next lake test. I'm open to suggestions to get it to run. Maybe go across the board and jack up the ECT tables? I've tried messing with the torque management setting but they had no effect. There has to be something simple that being missed here which is not letting this motor cut loose. This thing should be able to turn 5,100 or so rpm with the impeller that in the pump if I can get the last 1/3 throttle to work and for longer than a minute.
Here's all the files that go with the motor.