I've ported 3 GX heads over the years and simply used a dremel; nothing fancy clean up the casting marks, matched the manifolds and gaskets to the head. The one sport I removed a bit of metal was around the valve guide bowl area to smooth it out. The other area was the valve seat; where the seat meets the heat it protrudes into the head by as much as 1mm meaning it's cutting the diameter by 2mm, simply getting the seat flush with the port wall where they meet makes a big difference.

Yes an H89 oval port head or GX head would be a better way to go but since it's only your time nothing wrong with cleaning up the head you have. If,your budget is tight I would install larger valves and clean up the ports in the head you have. A good head may be anywhere from $500-750 so working with what you have isn't always a bad idea.

If your budget as room in it as the others have said just buy a better head.

Tom

I agree, u can ask PJZ for one that is not heavily shaven
but has some decent work done

Yes, better to get an A14 head and call it good

I'm sitting here and designing a set of intake-manifold plates and would like to just make it a part of the design from the start.

Something like this... ( Or will I hit the water jacket? )

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Hey guys and gals

Sitting here thinking a bit, as I have read a lot around the forum but still would like some definite answers..

What would be the best way to port a A12 head?
How high can you go/how thick is the walls?

Its for a street engine that will be raced once a while, but have just read so many different things..

I'm thinking a little about just raising the top a bit, and letting the bottom be as is.
Maybe doing something like what D suggests here, http://datsun1200.com/modules/myalbum/photo.php?lid=1777 , with makeing a D?

Or is it better just to get a A14 head and call it?

The motor is going to have a SC12/14 I'm thinking. Might go turbo if I can get i approved by the DOT in Denmark

Chears
Toby