Pretty much any time i have the head off one of my cars I throw a little bit of portwork at it. I used to do this stuff for work so its pretty easy to do some basics now and then when the opportunity arises.

I have done a few 1g and 2g dsms back in the day so i had a pretty good game plan for this one to begin with.

the die grinder i use and my favorite burr for this stuff.


this is a before, i ran the bit real quick on the surfaces just to get some light in there


right side on this one you can see i am moving the wall out. These ports are pretty big at the gasket surface then get pretty narrow right before widening back up at the bowl. I like to try to open up the sides a lot(the amount depends on how extensive i want to port, this is a 'medium-ish' kind of job since i daily drive my evo). on a head like this i usually wont open up the port at the gasket surface at all, its already the largest part of the runner.


this is a neat trick to gauge how straight the wall is and how your curve looks. it is very hard to tell by just looking but you can feel it by running your finger through the port. my old 1g head i made the walls all straight but this head im leaving some venturi in it. a little bit for flow but mostly because i dont feel like spending that much time on it and dont want to risk breaking through the port wall.


this is a good tool for making all your ports the same. its called a divider. when you start moving a lot of material deep in the port you lose most any kind of reference geometry so tools like this help a lot. you want all ports to be as close to the same as possible.





here is the start of working on the divider wall. i tend to make them straight and fairly sharp. left side is done, right side is stock


here is the center divider with both sides done


i usually dont move much material from port floors because of how important the short side is, but i do like to raise the port roof as much as i feel is safe. in the old 1g stuff i would cut the entire valve guide out and make the roof completely smooth but i didnt really want to push those boundaries with this head so i just cleaned them up some and raised the roof everywhere i could.

the short side is critical. very easy to cut too much material out.




Ill probably start the exhaust side tomorrow.

 

Make sure you get the valve seats cut on a Newen machine

Nothing like that machine for proper valve jobs.