[felix37]

Marvin, I would start by deburring all the casting marks,texture from the heads using a sandpaper cone with a die grinder and or dremmel tool with different size sanding drums. keep working to finer grits of paper, it's very time consuming and dirty work but worth the effort! once you get it really smooth you can start the polishing process by starting with a rough cutting polishing compound(usually black or dark grey) you can use a bench polisher and again use your die grinder/dremmel with different buffing attachments. keep working your way to the finer compounds (usually light grey and white) once your happy with the results I would recommend a good sealer to protect your polishing job.
jonathan