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Here is a ring that hasn't been ground properly. As you can see, the ends are no longer square to each other. It may not seem like much, but this can lead to a power-robbing loss of combustion pressure.
Piston Ring Prep - Ringing In The Power

 Here is a ring that hasn't been ground properly. As you can see, the ends are no longer square to each other. It may not seem like much, but this can lead to a power-robbing loss of combustion pressure.  View Related Article

 

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