Intake Valve Flow Numbers

If you need examples do more research. Your on the right track but there’s a lot more to it.
My take on you post was that there is no downside to an intake valve back cut and you did not note any of the possible other issues in your initial post.
My point was to note the potential down side of it especially in a racing application. If a well designed port and back cut valve are used, the potential of dilution becomes more possible and a loss of low end usually results with that. It’s another case of flow bench “progress” not quite being reality. That means among other things the camshaft design becomes more critical as you note in your response to my post.

In short- like everything else the whole design has to be understood and the package put together with parts that exploits its advantages and minimizes the negatives.

Not sure who can view this 17 year old post from Larry Meaux on SpeedTalk.com so I’ll copy and paste his comments. I’d would suggest you read anything he writes. Also look at Don Terrill’s book The Horsepower Chain and pay attention to the areas regarding cylinder blow down, the intake cycle, and camshaft overlap.

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Low-Lift Flow and Torque