Guys!

I'm making a few tiny adjustments to my factory 596 heads (previously DIY ported using the MP templates).

This is what the heads looked-like when I had finished them up:



My current adjustments really just thin out the valve guide boss further (slim it down). I also would like to remove the roof bump as in the following photo (keep in mind, the head is upside-down, so deck is pointing up):



My original attemp to do this resulted in breaking through, luckily this was on the sunk-in head-bolt, so epoxy took care of the issue, here is what that looked like:



...and the fix looks like this:



Alright...so as best as I can there I should not have this type of an issue with any other ports...the head-bolts there all are raised. Also, as best as i can tell there is no WATER passage in this area...is that correct?

Or is this a bad idea?