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 - Gatherin of the Orange - by Rick Nikolich. In July of 1998 I was talking to fellow Allis Chalmers collector Mike Schilling about the annual "Gathering of The Orange" AC show coming up in August of 1999. He got this wild idea that we should get a convoy of AC tractors and drive them from Charlotte, Michigan 105 miles to LaGrange, Indiana.
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