Painting cast head

To clean spark plug holes: old terry cloth rag dipped in lacquer thinner. Then pick the right size digit and do the ol' "finger wave" (like your family doctor) complete with rubber glove. Now that cleans with out leaving anything behind, including overspray.
 
Upon reading the initial post my concern was brush painting vs. spray painting a uniform thickness of paint into the spark plug hole depressions. I have never spray painted engine heads but have dealt with the care needed in spray painting convex and concave surfaces. Regardless, it sounds like you "sprayers" have had no problems in doing the spark plug hole task. I'm old fashioned and my personal preference for this kind of task remains with brush painting since it reduces or eliminates the time needed for masking work and gives me better control over paint thickness.
 
Now that I've painted heads with success and Drbrown brought up brush vs spray...

I'd like to re-paint the top of my radiator without removing it. Is there a good black paint for this that won't leave a brush mark?
 
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