From:Dave Hennessey
Subject:RE: Spark Plug Date:Tue Apr 10 18:59:40 2018
Response to:22615
I wouldn't do that. I'd get a spark plug hole thread repair kit.

I'm not recommending this particular kit, but it is the first one that came up when I googled. There are many others.

The inserts for these are not regular Heli-coil inserts. They are proper-length for spark plugs inserts, and have have a lip on the top so they can only go in so far.

If you're looking for an aluminum expert, look here

For my 1956 165, I needed to have the spark plug hole bored out to 18mm from the original 14mm due to stripped threads. A recommendation for an 18mm champion plug to replace the original champion H10 is appreciated.

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