It's been a long time since I posted but I have made some small progress. I made the flanges for the upper part of the manifold on my new little mill. I'm learning so I buggered it up a bit but it's still serviceable. Now just the plenum, pipes and manifold flanges.

One side has a recess cut to hold Orings, the idea being I can easy pop it off to get to the rocker cover/ rockers etc.

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Thanks, you just made me look at it another way. I might have another go at it before I make it. So many things to balance up.

Just saw your screen shot of the turbo manifold. When I made mine for my A12 manifold I used some short radius 90deg steam bends which will help shorten your number 1&4 runner length. Just a thought.

I think I'm almost ready to get some parts made, I'm getting some bends soon I'll just need to measure the pipe OD and make sure it suits the model before moving ahead. Can anyone suggest a cnc machinist in the Adelaide area?

I finally got around to finishing the next iteration of my exhaust design, seems to fit around my intake manifold. Lots of welding involved but it can use standard but weld fittings.

I might try 3D printing the exhaust manifold to see how it fits on the engine/ turbo. I haven't had a lot of luck printing big stuff before.....

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I've been thinking about it, I think I can approximate it with tube and sheet metal. Maybe next week I'll get some more time on it. I looked into 3D printing it but I think it's cost prohibitive (like 2-4k) which is a bit more than I'd be willing to spend. Traditional sand casting or wax would both work but I can't do that. I could probably print up moulds.

Anyway, I'll think about it a bit more.

I like the design but I have no idea how you'd actually make one short of investment casting or lost wax/foam casting.

Here's some pics of the exhaust manifold and how I would like to see it go together. I'll probably have to change the design a bit as I figure out how I'm going to make it but the main ideas are there.

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A12grunt, nice design of inj. spacer! Great idéa. Simple too.

This is roughly what I have in mind but I might change my mind again before I get to building it. Depends on where I land with the turbo exhaust manifold. I do like the idea of keeping as much of it away from the turbo heat as possible. Even the heat off the headers/ extractors is significant.

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