Here are the flow numbers for the Poly head.
Lift CFM Intake CFM Exhaust
.100 108.8 79.9
.200 179.3 117.8
.300 218.7 136.7
.400 236.1 160.2
.500 244.3 170.2
.600 254.1 172.6
Keep in mind we offer new camshafts in various profiles to fit your application. New stainless race grade valves in 1.94 and 2.02 intake and 1.60 exhaust sizes. Stroker kits to make the 318 into 392 cubic inches available in cast steel and forged crank versions.