It seems as though I can't post a higher resolution picture so here's a 3d scan. In my final part I lofted from the square to the round port and recessed the plate to help locate the tubing. It's 1.5" 0.065" so the inner port is .120" smaller than the outer circle.

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Nice work!

I have been working on something similar (not much time lately), I've designed a symmetric inlet flange and put a recess in there to accept 38mm (1 1/2") pipe. My landing for the injectors looks a lot like yours. The 3D printed plastic parts fit pretty good. Making the inlet flange symmetric just means there's an extra mm ish clearance on one of the bolts at the bottom, no big deal considering the way it's fastened. I tightened the clearance on the top bolts to locate off them, two location points means your less prone to tolerance stack up.

The part I haven't gotten sorted out yet is the best way to clamp the fuel rail to the flange plates. I'm also trying to figure out the best overall design to minimise fabrication since that's where I'm likely to make a meal of it.

What CAD package are you using?

I'll come back and stick up a screen grab when I'm on my other computer.

As a reminder, the CAD files (in DXF format) and the dimensionalized drawings can be found in our Manifold tech article: Manifold

Here's a quick grab of what I've been working on.

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I'm using Inventor.

The fuel rail I'm using comes from here: http://www.rossmachineracing.com/universalclamps.html
Their fuel rail brackets solved the mounting problem for me.

One thing about your intake flanges is to make sure they clear the valve cover gasket. I machined mine like yours and they didn't clear. I machined off the area that I marked in sharpie.

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Damn this looks SO good...
Now I'm totally in on making a set of my own xD
I don't have access to a mill tho...

EDIT: you wouldn't share the CAD file you got there, would you?

I thought the same thing until I looked at the plates that were on my car and saw they didn't clear the rocker cover either. Doesn't leak, just pushes it over a bit. Only leak I had was when I forgot to tighten the screws....

How do the clamps work? Is there enough material in the fuel rail to drill a through hole for the clamp? At $15- it's not really worth putting time into redesigning it. I haven't bought any components yet so that part was a bit of guess work at the moment.

Re sharing, I want to get get it to a finished state so there's no half baked versions kicking around. All I'd really hope to get out of it is a few sets of machined parts that I can use. I'm working on the rest of the manifold as well to suit NA and turbo applications.

Edit: I'm using NX.

Wow these look great, what ports do they suit? I'd be interested in a set or what you think they might cost? Are you going to share the drawings with anyone free? Looks fantastic!

Why do they have square ports? No A-series head has square intake ports?

That is for the exhaust?

Im trying to make a model my self while you take a beat ad it then :)
I'm using Autodesk Fusion 380, quite brilliant program, but not able to import the file dxf... So I have printed the photo and taking a couple of measurements extra for notes so it will be easier to draw/make.