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Piston Ring Prep

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You can't gap expander rings, but if you are willing to go through a few sets, you can probably find some that have a gap inside the bore, such as this one. Match these with scraper rings that have the greatest radial thickness.
Piston Ring Prep - Ringing In The Power

 You can't gap expander rings, but if you are willing to go through a few sets, you can probably find some that have a gap inside the bore, such as this one. Match these with scraper rings that have the greatest radial thickness.  View Related Article

 

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