A-Premium Iridium Platinum Spark Plugs Pack of 8 for GM V8 — Fine Wire, 0.044" Gap

These A-Premium spark plugs combine an iridium center tip with a platinum core to extend service life while maintaining stable ignition in V8-powered GM trucks, SUVs, and performance cars. Designed to match OE threads, reach, and hex sizes, this set replaces reference numbers like 91418 and ILTR5E11 and fits a wide list of Cadillac, Chevrolet and GMC models from mid-2010s through early 2020s. They use a 0.044-inch factory gap and a 5,000-ohm resistor for radio-noise suppression and engine management compatibility.

Which vehicles and engines do these plugs fit?

These plugs are specified for many GM V8 engines across Cadillac, Chevrolet and GMC lines, covering common passenger and light-truck applications. Verify part numbers and engine displacement against your owner’s manual before purchasing.

• Cadillac: Escalade & Escalade ESV (2015–2023) — V8 6.2L
• Chevrolet: Camaro (2016–2020) & Corvette (2014–2019) — V8 6.2L
• Chevrolet/GMC trucks and SUVs: Silverado, Sierra, Tahoe, Suburban, Yukon series (2014–2023) — fits 5.3L, 6.0L, 6.2L, 6.6L where specified
• Cross-check references: 91418, ILTR5E11, 12598004, 12622441, 12625058, 3474

How are these plugs built and what are the key specs?

Construction blends an iridium tip for high melting point and a platinum core for improved electrode stability. Critical dimensions match OEM requirements to ensure proper seating and heat range for targeted GM engines.

• Center electrode: iridium tip, platinum core for durability
• Resistance: 5000 ohms for EMI suppression
• Gap: 0.044 in; hex: 5/8 in; reach: 25 mm; insulator height: 53 mm
• Thread diameter: 14 mm to fit factory cylinder heads

What performance and maintenance advantages can I expect?

Iridium and platinum materials extend service life and help preserve consistent spark characteristics over tens of thousands of miles. Properly gapped and torqued, these plugs help maintain ignition stability and drivability across typical driving conditions.

• Longer service interval guidance: replace every 80,000–100,000 miles
• Fine-wire design supports precise spark energy and fuel burn
• High-resistance internal core minimizes radio and sensor interference
• OEM-equivalent dimensions simplify installation and reduce rework

How do I confirm fitment and install them correctly?

Always compare the reference numbers and physical dimensions to your existing plugs and vehicle documentation. Use a torque wrench and the manufacturer’s torque spec to avoid thread damage; apply anti-seize only if recommended for your head material.

• Cross-check listed reference numbers and engine displacement before purchase
• Use correct torque and sequence for your engine — consult service manual
• Check the gap if your engine requires a different specification than 0.044 in
• If in doubt, have a professional technician perform the swap

Who is this for: A-Premium Iridium Platinum Spark Plugs are aimed at owners of GM V8 trucks, SUVs and performance cars who want an OEM-dimension replacement with longer service life than copper plugs. They suit DIY mechanics and professional technicians seeking a cost-effective, high-durability ignition solution for 5.3L, 6.0L, 6.2L and 6.6L engines in the compatible model years.