yes "all" the K-series heads have a little lip inside the ports where the machining meets the cast port,,, with valves out you will feel it with your finger,,, round it off, blend it in, so the lip is gone & that`s all you "need" to do,,, removing any-more meat or trying to open the ports more will most probably take you backwards a step,,, unless you plan make the valve-seat holes huge & fit huge valves (which really isnt necessary) they flow very well with just that little mod , as the ports are already a tad big & if you look closely one side of each port is "biased" so there`s a little pocket in one side,,, quite a large area really,,, filling the bottom of the port helps but it`s way way way too much to go into here as things can get quite critical, you would want a flow-bench & some play-time filling & removing & shaping & well,,, we`ve been there & it`s painfull,,, but there are gains to be made "after" you have played a LONG time on the flow-bench
as ive said, they`re already very good heads,,, just tidy up those lips inside the port-bend & you`ll be sweet cheers Matt
_________________ No offence intended here but--> anyone writing a book about minis 30 years ago may not have experienced such worn or stuffed-with components as we are finding these days.
You should put your heart & soul into everything you do.
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