n8in8or
I never met a project I didn’t like
I hope that's just a stain on the main web and not what it looks like.....
If they did caustic soda bath on the block with the cam bearings in place, you should consider replacing the cam bearings.
Don't forget the clean and chase the blind holes with a bottoming tap. Run each hole a couple times until the tap comes out (mostly) clean. Dipping the block doesn't clean that stuff out....
Those are just stains, not the "C" word. Before sending it out I cleaned it with brake cleaner and then let it sit to see if anything seeped back out...it didn't.
They did the block cleaning before changing the cam bearings. I had them put new Clevite cam bearings in for me.
Yeah before assembly I intend to clean all threaded holes with thread chases.