[guru944]

Commdiver:

Yes, your point is well presented & taken.

Not everyone here can have a very technical background or can be a semi pro-race driver & consultant for more than 10 yrs or have the equipment or techniques to do research or test, measure, quantify and analyze theory, lab/dyno/flow bench and field application data results good or bad.

It is well documented in all 8 of my reference books including page 110 of Cartech book: Engine Blueprinting or HP Books: Engine Airflow pg 92 (see pix below).
That Stock valves can usually benefit from a practice called back cutting with a 10% or better improvement in low & medium lift flow with no loss in maximum lift, by eliminating sharp edges under heads which disrupt airflow.

Fact: No other port modification are needed to see these improvements.

Let's face it "Racing is research" Technique is key.
"Form follows function". Proper planning yields positive results. The best leaders come from the best servants in their service or ministry.