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Old 01-07-2015, 08:27 AM   #2
51 MERC-CT
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Join Date: May 2010
Location: East Hartford, Ct
Posts: 5,898
Default Re: Help needed refurbishing 51 Merc engine

It's obvious that the primary source of compression loss is the stuck valves. Once everything is loosened up and depending on condition no valve seat grinding may be necessary. Just some lapping. It all depends on the condition of the components and you have them in hand and are the only one who can make that determination.
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