Hand porting cnc indy heads

440-1 345cnc with 2.25 int valve size how much have you gained by having them hand ported. This is a race only 470 engine turns around 8000-8500 for rules i have to use the -1 heads

That is going to depend entirely on how good the cnc job and original valve job was. If they were mine, I would find out who is super sharp in the porting business, and gets the most out of stock/superstock type heads. My reasoning is that the valve job is extremely important in overall head flow, and they will know what to look for in working with your engine/head combo.

INT EXH
.200 155 127
.300 236 171
.400 295 206
.500 330 234
.600 347 255
.700 355 268
.800 360 280

hope those figures aren't the cnc port flow figures as my hand port -1's flow 360@600 & thats with the 2.19 valve.