REMOVE OIL GALLEY PLUGS
Most aluminum OHC heads have some oil galley plugs. Remove these plugs when rebuilding and blasting the heads with glass bead. When you remove the plugs after glass beading you will find that the glass bead will be clumped up behind the plug in the oil that did not get washed out. Sometimes these plugs can be stubborn to remove. In that case use a propane torch to heat the plugs. They will come out very easy.

Ronnie Myers
MAR Automotive, INC
Philadelphia PA
March, 2015