Ngk plug chop

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This link is from a free hand out recieved from NGK Spark Plugs back in 1977. It shows how to read an Ngk spark plug [this is good for reading a plug chop in general.] These are large pictures of spark plugs in various stages of a plug chop. A must see if you are doing a plug chop and don't know what to look for: Reading a plug chop