I’ve posted this in the old forum but worth another broadcast I believe. The heads I’m working on now probably have the best casting quality I’ve seen, but still not good enough. Check out the casting flash in what is probably the most critical cooling fin location:
I made a thin sanding disk using a piece of 7075, double sided tape, bushings, and 60 grit paper.
I flip the disk over to sand the other surfaces. The head is bolted to the table.
Here is the picture after sanding.
I believe this is a mandatory step!