Hand porting and porters is becoming a "lost art". CNC programers copy and use a hand ported head as a blueprint good or bad. I reworked a set of AFR cnc'd chevy heads that weren't worth crap and WAY off their advertized flow numbers. Hand porting is NOT easy work.

1970 Duster
Edelbrock headed 408
5.984@112.52
422 Indy headed small block
5.982@112.56 mph
9.42@138.27

Livin and lovin life one day at a time