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Originally Posted by mcaswell
If you want a satin finish, glass beading works well. Either way, as long as the part is clean, zinc will apply readily over existing zinc.
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If you bead blast zinc die-cast, you may want to put the part in a pan of boiling degreaser after blasting. Maybe I am working with older (and poorer) die-cast than your holly, but I have noticed that bead blasting tends to embed glass beads in the casting surface. I use #80 glass beads at 50-60 lbs of air pressure.
A good rolling boil seems to work out the beads pretty well. If the part has taken on beads, you will get a fine sandy layer on the bottom of the degreasing pan within a minute or two. The sandy looking stuff is cracked beads.
I like to lift the part out and let it drain several time at different angles to rinse the beads out of the jets. Seems to work better than trying to blow out each jet individually with high presure air.
Keep us posted on your results. There are a few of us working with carbs.