cleaning up the slant six head

Still trying to come up with an answer, I am considering that the reason the un-machined surfaces were not affected was possibly because of the ( as mntioned ) coat of paint that still remained on outside of cylinder head.

I am guessing at this point the paint acted as some sort of a barrier. Just a guess on my part, looking for confirmation.

I am not certain that the un-affected areas I tested were indeed covered with paint. I need to go back out there and look over the cylinder head and look for the scrape marks I made to see if I was attempting to scrape thru a painted surface.