SPARK PLUG INDEX TOOL 14mm FLAT & TAPER SEAT

Spark Plug Indexing Tool, 14mm Plug Thread Size. If you perform engine work, Allstar Performance spark plug indexing tools are extremely helpful in getting the job done right! It's no surprise that high-compression engines run better when the plugs have been indexed. These handy devices fit 14mm spark plugs, positioning the ground strap properly for the best piston dome clearance; they'll work fine with either flat gasket or tapered seats. In tandem, the index tool unshrouds the electrode for a more even burn and possible gains of 5 to 15 hp. Instructions are included for easy operation.