Cudafever said

OK now that i have read all 7 pages.
#1 That harbor freight electric die grinder is a total piece of sh!@%#$!^%$^&!!!!! with out a rpm controller you will NEVER get a long bur to live and you are going to get hurt.
#2 Running at about half speed it will work fine but vibrate the **** out of your hand.
#3, 1/4 and 3/8 and no bigger(Burs). Even a air die grinder you can get the long burs to helicoper. long burs = slower speed for control.
I never run a bur at full speed, unless i'm hogging something out(which i never do).........little by little i get the material removed and the shape i want.

I would get a box fan or some kind of fan blowing on that 5 HP compressor. there only like a 50% duty cyl and you can over heat the compressor and cause air to come out the compressor crank case vent..........ask me how i know!!!!

Your first port looked horrid!:p but so did did my first time with a die grinder:D and would be willing to guess, so did every on else, there first time.

Now with all that said you will get the larges jump in power with a good Valve job. At least a 3+ angle valve job.

My last advice is to leave the SSR Alone!(Short Side Radius ) The Water fall on the floor that drop in to the bowl/valve area.
Even with a flow bench you can completely destroy the air flow of the port and destroy the head( aka there is water underneath there as well)

As far as port matching, i have done it a lot, but wont be doing it anymore, just to make the ports match(aka matching to the gasket size). Cross section area must stay the same as it goes from manifold to head.

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