I have 55 belair with a 05 4.8L with gt45 turbo setup on it. I have a pull from yesterday that was on pump gas and another one today on straight E85. I can see I am about maxed out on boost with the 60lb injectors but seems like when going to the floor lambda is starting to climb into the danger region. I am not sure if to tell is it a tune issue or have I finally found the limits of the walbro 255 pump. I wasnt planning on having to upgrade to the stealth 340 yet but looks like may have to. Unless just need to change the ve table. Please take a look and see what you guys think. Thanks In advance.