Quote:
Originally Posted by JFP in PA
Perhaps, but they do have a very good idea on what it should take to get a correct seal on any brand of plug without damaging the threads in the cylinder heads.....
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They do indeed, but the plug folks recommend less than they do, which will not damage threads and be farther from doing so.
Yes, wrench calibration and operator technique certainly mean being "spot on" is unlikely.
VERY important is dry threads and reducing torque when reinstalling previously installed plugs. If someone just can't listen to those that make plugs, at least reduce the torque if you have to lube the threads, antiseize being lube of course.