Re: Rethreading Spark Plug holes in Aluminum Heads
some time ago i had a head repaired with a shouldered insert but the guy that did it inserted the insert from the cylinder side and the blended it back into the chamber when i questioned this he explained that the plug is always harder to remove than insert so you actually pulled the insert into the head when removing the plug [who knows but it worked] and ended up doing them all best of my knowledge its still going 30 years later
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