And that's something you could do at home with a Dremel. There was talk before about how far to go before it starts costing too much. Us street guys that bought these heads don't need much but there are a few things that should be addressed as mentioned in these threads. I feel a correct valve job is #1 on the list. #2 should be deburring and bowl blending and #3 on my list should be gasket matching (if needed). You could run these heads without doing any of the above modifications. But a little extra will make them better.