Spark Plug Adapters- Black oxide coated. Uses 14MM spark plugs. Set of 4. Allows you to use inexpensive spark plugs, intended for modern cars, and experiment with different heat ranges for use with different carburetors or cylinder heads. USA made. Can also be used with a compression tester to check engine compression. If you want a single one to use as a compression tester adapter only, then order our A-6056.
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