Well, with an A/F ratio like that, you should see a "black cloud of death" coming out of the exhaust at WOT. Do you notice a lot of black (fuel) smoke at WOT? Makes me think the wideband on the dyno perhaps wasn't reading correctly. There's definitely 10 or 15hp lurking in a tune if that A/F is correct. Order you some HP tuners or LS1 edit stat!
