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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.
(Redirected from Cold shut) A casting defect is an undesired irregularity in a metal casting process. Some defects can be tolerated while others can be repaired, otherwise they must be eliminated. They are broken down into five main categories: gas porosity, shrinkage defects, mold material defects, pouring metal defects, and metallurgical defects.