Breathing deep (porting my heads)

[bmxmon]

I am using a spring compressor that is shaped like a C. It has a large bolt thing pretty much, that you turn and it pushes againts the valve and valve spring. Well, i got one exhaust port Huge bump thing grinded down, and it looks pretty good. I think that I will just grind those down and then just smooth everything else out. Im not going to touch the combustion chambers, they seem scary, lol. One question that i have now though, is that the hole for that sensor thing that that hump is made up of is long and oval, do I want to try to get rid of that as much as possible, or leave it be?? I have been doing all of my grinding thrus far from the headers/heads port side. As for the area i was thinking of, was just any area! All a bit scary to me yet. The funny thing is that I am doing all my work on it at school, so all the other kids think Im some kind of genius of engines now, haha. I just hope the thing runs when I am done with it...............Thanks for all the help.