i have flowed ported and non ported early 5.7 heads. without digging them out........i think i remember the early 5.7 stock flowing 270ish and ported 305ish? my 462 is a aluminum blocked motor. 4.200 crankshaft, 4.185 bore. thitek 2.20 heads, lsm cam specd by me,12.8 to 1 comp, arrington 1.7 roller rocker arms, it has a hogan sheetmetal intake on top with a 168mm tbody. it is a pump gas motor and is no kidding what i drive everyday(i dont drive far though). its in a 2006 charger and the goal is to click off some 10.0s in my 4300lb whale. on top of that it has a 300hp nitrous outlet direct port that i will get dialed in after we get the motor on point