with a 800 hp goal. and looking to run 9.00 with the dart..i did some home work and found a guy buy the name brett miller.even though he is 3000 miles away i sent him my w8 heads.that flowed 338cfm with a 2.15 intake valve.14 days later i had my heads back home. and on the flow bench.please keep in mind all that shipping time.. these heads will flow 395cfm.on any bench with a 2.15 intake valve. we could not believe your eyes i feel like when i meet brett i meet a friend for life . he walk me through this w8 build.. my motor made 823hp at 7700 rpm and and 638lb at 5600rpm. this was at QMP racing here in so.cal. we did not tune on it much. a jet change and a little timing was it. keep in mind this is a 13to1 pump e85 cast intake single carb motor. more could have been found but 800 was the goal.. i want to thank brett AND A BIG THANKS TO BRAD @QMPRACING. and justadart