That too. Going to be a combination of things. I let myself move too fast, starting with the long bit was stupid, but I stopped before it causes any real issues. I need to improve my setup and go back at it.
I just used a 5/8 reamer that I turned the end down on with a tool post grinder and skipped all the rest.
There is no reason you can’t just use a reamer if the end has a chamfer on it. You are reaming a cast passage that’s isn’t real straight to begin with. As long as you get down through there and don’t blow out the gallery (which is pretty thick) you should be ok.
