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Removing the flash from a casting is beneficial in a head because it eliminates the swirling effect of the air/fuel. Don't go taking lots of metal out, just smooth out the surfaces and you should be fine.
In metalworking and jewellery making, casting is a process in which a liquid metal is somehow delivered into a mold that contains a hollow cavity (i.e., a 3-dimensional negative image) of the intended shape. The metal and mold are then cooled, and the metal part (the casting) is extracted.