MSD 3726 Iridium Spark Plug
14mm - .750 in Reach - Gasket Seat - Single Pack;Proprietary plug design inside and out; Designed for use on high performance vehicles that utilize high output ignition systems; Machined electrode increases exposure to the flame to improve combustion; MSD’s proprietary ceramic formula provides the highest dielectric strength; Yttrium ground electrode reduces the chance of pre-ignition; Iridium tip improves cold starts; All spark plugs tested prior to packaging and shipping; Unique insulator design improves spark isolation; Lower voltage Requirements for longer coil life;