These are a Perfect Upgrade For your Power Adder - 1 heat range colder than stock plugs.
Autolite Revolution HT Spark Plug Features:
Unique High Thread Design for More Power
Superior Cylinder Head Seating Postion
Better Compressive Seal
Improved Heat Transfer
More Focused Ignition
More Durability
Longer Service Life
Improved Corrosion Protection
Requires 9/16 in. Socket Wrench
