Had a chance today to finish my cylinder head test. I started out with a virgin set of small valve G heads. Tested on a 4.155 bore, SF 600 bench @ 28 inches, Brezinski flow adapter. Flow bone stock: .200/122 .300/172 .400/196 .500/209 .550/215 .600/220 .700/226. Same head ported 2.072 valve 45 degree seat: .200/156 .300/210 .400/247 .500/267 .550/270 .600/273 .700/278. Installed a 2.100 valve with a 45 degree seat, more porting, :.200/158 .300/213 .400/251 .500/270 .550/274 .600/275 .700/278 .750/282, @ full lift, retainer hitting the guide flow was 298.5. For now Im done with these heads, but I would like to try some more valves shapes in the future. Picures of the test can be seen on my 455 build thread.