Danno Posted June 3, 2015 Report Share Posted June 3, 2015 Hi everyone. I'm new here but have read some of the great post you all have made on past issues. A few days ago I purchased a nice one owner 1997 Deville with 79,000 miles. It runs fine with no appearant problems now but I'm concerned about the inevitible head bolt thread problem. I just performed the engine block test that checks for combustion gas in the cooling system and it passed the test. I'm fairly familiar with the process of drilling and tapping the engine block and installing inserts to address this problem but can it be accomplished without pulling the engine? Quote Link to comment Share on other sites More sharing options...
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