Under Cut Stems VS Back Cuts (Flow Bench Test) Vortec Heads

Vortec Intake valve testing
Do Under Cut "Skinny" Stems add Flow? Or just a reduction in valve train weight?
What about back cutting the valves?
Here are some flow bench test results you may find interesting

*Flow testing done at 28" 4.030 Bore with stock style 3 angle valve job*

*forgot to mention in the video*
The backcuts are approx .050 wide

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