Whenever i go wide open throttle my car puffs black smoke, not extrememly bad but noticable. I have bosch O2's in it now, not throwing any codes. Should i jsut go ahead and buy the delco's? Any help on the rich condition is appreciated, btw, the car runs like a raped ape.

Zach Horn

 

Your car is already leaned out from stock settings, so you could still be running rich some, (but I would not lean it any more without some air/fuel readings from a wideband dyno) but either way, I would definetely get some AC Delco O2s.