Ngk plug chop

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External link: reading a plug chop

That link is from a free hand out received from NGK spark plugs in 1977. It shows how to read an NGK spark plug, but is a good reference for reading a plug chop in general. It includes 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.