Thanks for sharing the lesser path.
273 closed chamber, 310 casting,1.78 valve
Ported. 1.78 int
.100..59
.200..122
.300..175
.400..200
.450..202
.500..200
.600..205
Final port volume..135cc, chamber 66.5
Un ported.. 124cc port volume 1.78 int
.100..51
.200..107
.300..154
.400..159
.500..165
.600..166
Just more grains of salt...