I am working with an old housing, trying to build some skill before going after my final engine plates with my Dremel. My goal is to make a medium street port. Here is my progress so far:



Next time I won't go into the oil control ring track or go down as far. The port area is larger than the runner leading up to it as it now stands.

what kind of carbide bit are u using for with the dremel?

Carbide bits are not needed. The normal gray stones work fine for me. The white ball shaped stones are perfect for smoothing in the bowl after the port shape has been roughed in.

pics?

Here is one that I think Judge Ito did. (I got the pic from the evil forum)

I found some more info on Na ports and realized that I was copying the FD ports in the porting thread . . . so I did this one a little more like how Mazdatrix and Racing Beat do their NA primaries.

Time to buy more porting stones. https://www.nopistons.com/forums/pub...IR#>/smile.png

thnx for the pics. haha i love how you put that one in your sig.hehe

Hence the reason I use carbide solely for the rough porting. I do use the stones for medium finishing though. Also use lots of sanding rolls with my 60K rpm 1/8" die grinder.

Well I think I have my primary shape to where I want it. I am trying to keep it small but add some duration and have it flow well.

I sprayed some compressed air through the runner and it ended up reaching the far end of the intake chamber, which was what I was hoping for it to do. My goal was to direct the intake charge in the direction of the moving combustion chamber.



Here is how it looks when it is about to close, still able to flow some air: