I'll upload a cross section of the head (it replicates the engineering drawing on wiki). It uses the standard pushrod length and angle. To actuate the inlet valves it needs an additional rocker shaft added on the other side of the pushrods.
From my model the pushrods are almost the only thing that you can use apart from a few rocker pedestals.

I have printed a cross section of the head, including valves and rockers etc. Bolted it onto a block and had the valves actuating. That’s about as far as I have got.

With regards to casting, technology is progressing very quickly and with 3D sand mold printers being used for R&D and low volume parts - it all might be achievable!

Have you seen Derek from Datsun Works Twin Cam L Series head? His heads have been cast using the 3D sand printer technology
http://www.datsunworks.com/Blog/

That project is amazing!!

Here is the build thread on the whole project. Amazing accomplishment

http://forums.hybridz.org/topic/11964 ... rom-derek-at-datsunworks/

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I did look into the 3D printed moulding sand after visiting the advanced manufacturing center at CSIRO in Clayton Victoria a few years ago. It is true that you can print one off sand cast moulds but from memory the cost was in the 1000s.

You may be better off working with a pattern maker. The now retired pattern maker at my work built a mould for a custom triple webber setup for his Cortina. Pretty cool. At least you'll get to use it more than once. An alternative might be 3D printing the mould masters. These would generally be treated with a carbide embedded epoxy since the moulding sand is abrasive. Again, getting a pattern maker involved would save a lot of time/ pain if going the route of casting.

There is a lot involved to get the AY head to make hp
so dont forget the camshaft profile, timing, pistons,
valve and chambers,exhaust and induction have a big part as well.

The speedway guys where making 25% more than the A series
head by using the e15 8v heads. OHV of corse but easier to
make hp are the miata heads in terms of budget and information
available freely to anyone who wants to.
There are many 1.6 making 160hp atw using OBX cams, milling head 2mm!,
racing beat headers, sports cat, 45mm webers with Rowland inlet manifold
(only 168aud plus 40aud landed!) and ecu to run ignition only or cheap
megajolt crankfire ignition.
Same mods on a 1.8 Bp yields just 172bhp atw only 12hp more for 200cc extra.

I love the DOHC mods people have done. These setups make really good power.

The AY is way more complicated than I am willing to step into right now. Right now I am setting the A12 head up and pulling dimension for model creation.

I had that model quoted using a sand printing mold/casting company and it was a fair bit but it will never be a cheap project if I ever do it anyway. Beauty of it is any changes to the design can be easily tweaked for the second or third casting etc. Investment casting is another option too. The water gallery is near impossible to pull a pattern off and sand printing or investment casting takes care of that.

As for making a billet head with water jackets I have no idea how you would tackle it all. Have looked into it a few years ago but seems near impossible to remove enough material from above the combustion chamber. A lot of the billet heads I came across for drag engines on methanol.

The twin cam head is pretty awesome engineering feat for sure but its no AY12 replica

The AY head is amazing, its that unicorn piece that for example the ohc version for the L6
engines command 100k usd and even more and its only a 2v hemi chamber design not the 4v LZ

The OHC e15 hybrid versions running alcohol have been rumored to make 30hp more than A series heads

Billet heads are usually done in 2 pieces then welded together as Ive seen 10 years ago for chevy heads

I would really like someone to get permission from Koenisseg for his freevalve heads
https://www.youtube.com/watch?v=OZWeNPi2XkE

I have a good idea for water jackets on the billet head, but it just means more O-Ring gaskets.

No big deal.

I just got a new production contract with a local company so my time to play with items got narrower. I do plan to purchase another CNC mill with this added work load and that should make for simultaneous effort on fun stuff while the other CNC does the production.