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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.
Flashing is usually described as a percentage of exposure increase to the film's base fog level. While the flash itself is often a neutral color temperature, the flash exposure could be any color: the color of the flash will be imbued disproportionately into the shadows of the image.