Hi GXman,

You might read some of the Ford or Chevy sites, and see what they say in general about "combustion chamber" matching. It seems like it would be safe to remove area around the edge of the chamber ... but I don't really know.

Its not hard to do at all, especially on an A series in a low state of tune.
All you need to do is grind a bit out of the chambers depth, avoid changing the outside shape of the chamber or working close to the valve seats if you are new to this type of work.
Dont be frightned about doing it because you will be surprised just how easy it really is once you start using the die grinder.
Remove some material and re CC to check, then redo as necessary. Dont take too much material out, go slow, take your time and you should be OK.

Ok guys.
I want to come back to this post of mine.
I am now planning to do as 1200coupe said.
Now my question:
Is there not some water ports that I will hit along the way?
How deep can I go? Will I be able to remove 2 cc's from the chamber by grinding not along the edge of the chamber but downwards to make the chamber more hollow.

I am planning to take the cylinder head to a guy who does all the drag racing guy's cylinder heads here where I live and talk to him explaining my problem.
What do you guys think?
I talked once over the phone with him and he sounds like a old guy.Meaning, maybe he will know the GX head's design very well and will know where to do what.
I also want him to put in A15 valves and gasflow the exhaust ports, swirl flow the intake ports and polish the combustion chambers.
Any info welcome.