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Allstar Performance Spark Plug Indexing Shims

4.63 out of 5 stars 8 Customer Reviews

Improve the burn with Allstar Performance spark plug indexing shims. These aluminum washers make every spark count by allowing you to expose the open end of the ground strap to the fuel/air charge. The packs contain silver 60 degree and black 90 degree shims, along with instructions and a dial chart. Put your plugs in a winning position with a set of Allstar spark plug indexing shims.

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