Here's the results from our Stage 2 porting on Ford 300 I6 head. Our stage 2 porting on this head gets full porting on the intake, exhaust and chambers, 3 angle valve job, 30 degree backcut on the intake valves, before and after flow testing and spring setup.
This particular head also received a full rebuild with a few valves that were replaced because it was in bad shape.
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Stock flow numbers:
lift. Int. Ext
.100" 61. 43
.200" 103. 71
.300" 138. 97
.400" 151. 108
.500" 152. 113

Stage 2 flow numbers:
lift. Int. Ext
.100" 78. 65
.200" 139. 106
.300" 180. 130
.400" 188. 140
.500" 193. 154

testing done the same way using the same fixtures at 28".