Engine required GPH
and extended WOT situations, like going down a drag strip
I ran my 408 with a stock style mechanical fuel pump for a half a year before going to the track for the first time
never had a problem in daily driving , highway on ramp sprints...whatever
until I went to the dragstrip, clocked the 1/8th mile at 74 MPH, drained the bowls and clocked the 1/4 mile at 72 MPH
I replaced it with a 120 GPH mechanical pump, but I haven't had a chance to try it out yet