ihave my 610 cuin hemi at 9.57 to 1with a f-2 procharger , big tuning window, first pull with a educated guess tune up it made 1381 hp at 16 lbs of boost at 6300 rpm on out of the pump e-85 it was acually e-87 ran a 5.68 in the 1/8 on the street at roadkill nights pontiac mi in a 3960 lb street trim car but i drive it more than race it thats why i went with e-85