Match Race 1972 ~ 'Road Runner/GTX 440' vs. 'Buick GS 455'

Have you seen any flow numbers for the Stage 1 heads? I know most Buick castings were the same as far as port dimensions, but with the larger valves???

I did find this posted on V8buick.com from 2006, but it was the "148" casting with standard 455 valves...2.00/1.625.

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"Flow results: '72 455 "148" castings, standard valve size (GS 455 heads)

Valve lift in inches
Intake stock Exhaust stock
.100 59 52
.200 120 100
.300 175 124
.400 208 140
.500 218 147
Averages (.200-.500) 180 206 128 149

Specifications: Intake valve size - 2.00" : Exhaust valve size - 1.625

Flow numbers in Cubic Feet per Minute (CFM) flowed at 28" H20"