haha, no, its not that datsun competition.
id take some pics, but my girlfriend has taken the camera to Brissy for the next 2 weeks.
wiki mentions nothing about 39mm ports.

Tell her to buy her own camera, you have more important stuff to photograph.
Better still, buy another camera & give her the lesser one of the two.

I never measured port sizes, once you know what these heads look like you don't really need port sizes for identification [most times].

Without actually seeing it I can only suggest that if the ports are noticeably larger than the published numbers, & if it isn't a factory competition head, then I must presume that it has received some work in that area.

it IS her camera!! i lost mine somewhere along the way.

i can say unequivocally that the ports have been unmolested.

Oh you're a sad case mate, no camera & she shot through with hers. What a bummer. LOL.
Tell her that she should buy you a new one in the big smoke while she is away because you miss her terribly & you're worth it.

Anyway, this is the second best piece of A series porn that I know of.
[No. 1 is the AY head]

This is Ferals Factory Comp head & it belongs with his all out A13 race engine.
Forget the roller rockers & check the inlet port bulges in the top of the head. Apparently they restricted the long distance race engines to about 10,200 rpm to ensure reliability.

As always, click on the image for a larger view.

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you know, she is probably thinking the same thing knowing her....

that head of ferals is a nice bit of gear.
i wonder how many people have unknowingly possessed such a thing and been none the wiser. it would be hard to tell with an untrained eye.

I would suggest that very few were ever sold & that the chances of someone having one unknowingly would be fairly slim.
Still, stranger things have happened.

P.S.
Click on this link to compare your port sizes with this.

i shudder at the thought of someone now knowing they have a competition head and throwing it out for $10 of scrap alloy.

once they are gone they are gone. On that topic, are the castings for a series heads still around? perhaps if they arent selling them anymore then the castings could be up for sale at the right price to the right person.

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Definitely. They are still producing new A-series engines, at least they were in 2009. They stopped A14 production in 2007 so only the A15 is left (as far as I know). The A-series is manufacturered by Aichi.

But the castings with the raised ports were only used for works and semi-works competition engines. Who knows where those molds are...or the GX molds...