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I just got a 12:5:1 cp piston and I was wondering if anyone had to adjust their ring end gap or have their cylinders honed to run them or did you just put it in and run it
 

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Making HP ain’t free. . .
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Yes, I’ve had to file some sets of rings, and yes I’ve been able to just run others.

Regardless of what others have done, the responsibility is yours to properly measure your ring end-gap and determine if it needs to be filed or not. Every situation is going to be different. Fresh plating, a worn cylinder, intended Usage, etc. will Have an affect on whether you need to file the rings or not.
 
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