Allstar Performance Spark Plug Indexing Tool M59XS3 Dual mount shims fit between

Dual mount shims fit between the upper control arm and chassis mount to adjust camber

1967-1986 Mercury Marquis

Mopar Cable

GM Fullsize Truck 2001-10

Allstar Performance Spark Plug Indexing Tool M59XS3 Dual mount shims fit betweenIndexing 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