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wrench87: Last time . . . so you can get the exact end gap for the exact bore size you're installing the ring in. Production engine shops don't use file-fit rings . . . race engine shops do for the reason just stated. Material doesn't have anything to do with it. Drop in simply means the rings are pre-gapped for the specified bore size. 
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Tom
"If you can make black marks on a straight from the time you turn out of a corner until the braking point of the next turn, then you have enough HORSEPOWER." Mark Donohue
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