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

Hi guys, I was going to be making contact soon. I have a written peoples names down who have expressed interest. Will be 1-2 weeks away and I will make contact then.
Sneak peak

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

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

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/

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Using the AY12 images from wiki

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Here is something I was working on for some time. It's almost a complete design for casting.

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They were $600AUD each. I have just sold my last one. I might look at doing another small batch run if there is enough interest?

Possibly look back into casting a few or machining them out of billet

That was me. I have one billet one here. I can email you photos if you like?