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Drop-In rings means they come already gapped for the application.........DO NOT ever trust this, ALWAYS check the rings in the bore they will go into........
99% of the time, they will be spot on, it's that other 1% of the time when they were mis-labeled or accidently put into the wrong box that will destroy your high dollar motor......
I've used both and had good results, file fit are kinda a pain and time consuming to get right, but when they are right, they are right...........
David
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DAVID GAGNARD
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