It would be interesting to flow a stock head, machine and install 2.02/1.60 valves and flow again. You can increase flow by back cutting valves so larger valves should increase flow to the point the ports stall. What's the restriction in 318 heads? Valves, port size or both. I say both but modifications to either will increase flow until the other can't flow any more. @pittsburghracer have you flowed any stock teen heads?
