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You don't really see any major increases in HP(less than 3hp). Pent-roof cyl. heads flow extremely well and the 1mm you can stuff in there barely helps at all. Most of the gain is from the 3/5 angle cuts made in the valve seat to make the valve fit.
If you are replacing the valves and seats anyway it can't hurt. But, if you are looking for just performance gains. Cams are going to be the same price as the valve job.
OHV Heads are totally different and should not be compared.
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Comments should be taken as Opinions not as Statements of Fact 
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