The most important area in a flowed head is the 1/2 inch before the valve seat.I dont think 10% is realistic ,but under the theory of every little bit helps it could be a better running engine with the casting flash smoothed out.Now all kinds of guys are gonna warn you about smooth intake ports,fuel puddling etc etc.Im just saying it cant hurt.If you really want to go at it you need Cratex rubberized grinding wheels and work the seat area to a nice radius in and out of the valve seat.Kinda like a 30 thousand dollar Serdi does with cutters.I have a whole file drawer on air flow and there is quite a bit to it.You are trying to improve volumetric efficency.Other improvements of power are thermal efficiency,and mechanical,but biggest gains are from volumetric efficency improvments.So yeah it cant hurt power[it can really but thats a whole new subject called ports too large]
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Today's Featured Article - A Cautionary Tale - by Ian Minshull. In the early 1950s my father bought an Allis Chalmers B and I used it for all the row crop work with the mangolds and potatoes, rolling and the haymaking on our farm. The farm and the Allis were sold and I have spent a lifetime working on farms throughout the country. I promised myself that one day I would own an Allis. That time event
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