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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.
A technique for casting sculptures or other objects in metal. A model of the object to be cast is created in wax, fitted with wax rods, then encased in a heat-resistant material such as plaster or clay, leaving the rods protruding. The ensemble is heated so that the wax melts and runs out (becoming the lost).