P&P aint as easy as Kliff makes it sound. hahahahaha. To a guy who can port, it's simple as can be. I read an artical from one of the top head porters in nascar and he said for the first 5yrs he actualy made some engines slower. Now any one can clean up a head and make it flow better. But dyno numbers dont lie. I can send any one on this site one of my cylinders from my stroked 400 and you wont pull 70hp out of it like ritter or hpd can. They have hours and hours and hours on the same tyoe cylinder, to flow bench, and back to the lab. Then add a stroker or a bb kit, the squesh needs readjusted so back to the lab back to the bench back to the lab. There are machine shops and engine builders and then there are race winning builders
So before you undertake porting on your own, you might do a little research on how to flow a head. To much os just as bad or worse than to little. So a guy who's done a few engines should always out flow a guy with some long shank bits.
Most gains are found in places you cant reach, so have the right tools
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