I say flat out BS to the speedmaster listed exh flow number of 72 cfm@ .100” lift !!
If true then that 1.66” exh valve is flowing as much as the 2.11” intake valve, while having 25% less curtain area @ .100” lift.
It’s either produced by a mistake in the lift point used in the flow testing , or a back cut exh valve was used, or some of both.
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