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Iridium tip promotes the best spark and increases plug resilience for longer life
Proprietary ceramic insulator enhances dielectric strength for reliable ignition
Yttrium copper core improves heat resistance in high-horsepower applications
Machined electrode and 1 mm tip ensure precise fit and optimal performance
Machine ground straps with yttrium handle high heat for consistent drivability
Summarized by Shop
MSD iridium spark plugs will fire up your engine for optimum performance. These plugs have been engineered from the inside out for efficient combustion to create the most power possible for your setup. MSD's proprietary design features center tips made from iridium--a super hard material that promotes the best spark as well as increased r