I have a set of 04 pi heads with 25k on em and they have all new valve seals and were steam cleaned. The intake and exhaust ports seem to have rough ports i guess from the factory. Would it be bad to take a low grit sand paper and smooth these things out? I not going crazy and not reshaping the ports or anything like that. Just smoothing them out to where my fingers will reach. I could get any left over shavings with a shop vac so not worried about that. Just wondering if it would be a bad thing at all.