Ok, here are some comparative flow numbers from one of the previous sets of CJ heads that I used:
*Stock head, factory valves, no work.
.100 64 52
.200 124 87
.300 182 118
.400 211 144
.500 224 164
.600 231 174
.700 236 179
*Stock head, Ferrea 3/8" valves, no work, 45° intake/exhaust seats:
.100 80 64
.200 139 100
.300 195 133
.400 230 162
.500 246 181
.600 253 188
At first glance, I thought I had wasted an hour or so of labor, but if you look closely, we did pick up a few cfm on the mid-lift numbers in comparison to the 3/8" Ferreas.
To be honest, I was hoping for a little more, but the main goal of this R&D was to get some valves that were extremely light for an upcoming 390 build. FWIW, the intake valve is titanium and weighs 86g. The exhaust valve is stainless and sits at 88g.