Thanks for clearing that up ddgonzal!
Everything makes a lot more sens now
I see now how getting a A14 head is a no brainer, as it's not for a racecar but my daily, and me just wanting some more power ^_^

Here are some old pictures that might give you an idea of what is inside and how thick the walls are.
This is an old A12 head that I cut in sections on a bandsaw.

http://datsun1200.com/modules/myalbum/photo.php?lid=10828&cid=12



http://datsun1200.com/modules/myalbum/photo.php?lid=10829&cid=12

YOU ARE A GODSEND! Just the pictures that I was looking for

They Just wasn't on the porting wiki and couldn't find them...

Thank you SO much!

You may add those photos to the Head Porting article -- just click Edit

Would some of the guros be kind to take a look ad this porting design? :D

I'm just so insecure when it comes to this as I'm new to the porting world :)

EDIT, I'm am afraid that the edges of the 'D' will break into the water jacket... the edges are 22mm from the centrum, compared to the 15.5mm cirkel that it normally is :/

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Yes, i believe that will break into the water jacket. Note that the head has circular jackets, so porting in a slightly larger circle will be OK

Just curious as to why a D shaped port is in your interest?

I've heard of D-shape exhaust ports, the shape helps with reducing exhaust gas reversion etc. Never seem D shaped inlets though.

Popular upgrade for the v6 Capri motor. Scroll down.

http://retrorides.proboards.com/threa ... ll-me-early-scimitar-gtes

Just an inkling on my part, the improvement of the D port on this particular head may have more to do with the details of the short turn radius (port floor to valve) or the port area than the port shape it's self.