NGK Laser Iridium Spark Plug IZTR5B11 (Box of 4) for Select Buick, Cadillac, & Chevrolet 1993-2020

Fits select 1993-2020 Buick, Cadillac, and Chevrolet models including Corvette, Silverado, Escalade, and Express 2500/3500.

NGK Laser Iridium spark plugs are engineered for drivers seeking the highest level of OE-spec performance and longevity. Designed as a direct replacement for factory fine-wire iridium plugs, the IZTR5B11 features a laser-welded iridium-tipped center electrode. This construction provides a stable spark and superior durability, with a melting point significantly higher than traditional platinum or nickel alloys. To ensure even wear in modern distributorless ignition (DIS) systems, most Laser Iridium plugs utilize a platinum pad on the ground electrode.

The high-grade pure alumina silicate ceramic insulator provides superior dielectric strength and thermal conductivity, while the 98% pure copper core aids in rapid heat dissipation to prevent pre-ignition and fouling. Every plug is finished with trivalent metal plating to provide long-lasting anti-corrosion and anti-seizing properties, making future plug changes easier.

• Manufacturer Part Number: IZTR5B11
• Center Electrode: Laser-welded Iridium tip
• Ground Electrode: Platinum chip/pad for consistent wear
• Construction: 98% pure copper core for maximum heat transfer
• Shell Coating: Trivalent metal plating for superior corrosion resistance
• Sealing: Triple-seal process prevents combustion gas leakage
• Quantity: Pack of 4 spark plugs