Allstar Performance Spark Plug Indexing Tool R01P003XXL shoes and all your other

shoes and all your other accessories

European style cam mechanism

Finned aluminum coolers have 3/4"NPT ends and T-slots for easy mounting

1-1/4 in ID

GMC: Sierra 1500 19-19 AT4

Allstar Performance Spark Plug Indexing Tool R01P003XXL shoes and all your otherIndexing positions the ground strap of the spark plug properly for best piston dome clearance and un shrouds the electrode for a more even burn and possible gains of 5 15 horsepower. Works with flat gasket or taper seat 14mm spark plugs. Includes instructions. Specialty items for the Shop, Trailer and Track. The Allstar Performance brand offers thousands of hard to find, specialty items that cover many segments in the performance aftermarket. For over