Small Block Head Flow Chart

Okay here are the numbers

Intake

Advertised. Flowed. Ported

200- 142. 123. 139
300- 202. 189. 201
400- 251. 236. 244
500- 278. 268.5. 270
600- 284. 282.4. 292
700- 286. 282.6. 293

Exhaust

200-124. 98.5. 108
300-158. 135.4. 146
400-190. 169.9. 182
500-203. 200.7. 211
600-219. 218.4. 229.9
700-231. 223.8. 242.3

These tests were on a 4.070 Bore FYI