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Austin, I have found many D's with the top piston ring groove worn like that.. You have a few different ways of handling that problem.. First- is to stick the pistons in a lathe [or have it done] then buy custom made rings to fit the new groove width.. Next- would be to do as above but buy ring backers first [thin ring spacing shims] then cut the ring grooves to match the new ring + backer width.. Next- would be to use double rings as you suggest.. If for parade & light use only you can also leave the top ring out.. I usually buy the ring backers from Otto�s pistons rings then put the pistons in a lathe & cut the grooves to match the new ring + backer.. 2 rings will work but double ring thickness can bring on other problems.. If you do go the double ring route use thin rings for the second ring, as thin as possible].. You might want to talk to Otto�s Gas Engine Works [410-398-7340 ] as they have all kinds of cures for that worn top ring groove.. [email protected]
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