Finally got the machine to submit. Here is the first cut.
View attachment 3967
and on the engine.
View attachment 3968
The pattern is close but needs some tweeking, you can see the bright silver through the flange on all 4 holes, that's how far off the holes are. I have no idea how far off stock manifolds are or aftermarket headers for that matter.
I cant seem to edit the DXF file or measure anything on it so I'm thinking about pulling the head on this engine, I can fixture it up on the mill and use the DRO to locate all the holes, then I can model the port side of the head with all the correct placements then I can move the holes as needed.
Anyone in the Portland OR area have a head off that could be used for this so I don't have to break down this engine?