A-Premium Iridium Platinum Spark Plugs for GM V8 — Pack of 8 Fine-Wire, Iridium Tip & Platinum Core OEM Fit

A-Premium Iridium Platinum Spark Plugs (pack of 8) are fine-wire, dual-metal spark plugs designed to deliver stable ignition and extended service life for GM V8 engines.

These spark plugs pair an iridium-tipped center electrode with a platinum core to offer a balance of high ignition performance and durability. Built to OEM-equivalent specifications — including a 0.044 in gap, 14 mm thread diameter and 5/8 in hex — this set suits numerous Cadillac, Chevrolet and GMC V8 applications. The plugs are intended as long-life replacements, with manufacturer guidance recommending inspection or replacement around 80,000–100,000 miles depending on driving conditions.

Which vehicles and engines will accept these spark plugs?

These A-Premium plugs are engineered to fit a wide range of General Motors V8 engines, from 5.3L to 6.6L. They cover many model years for Cadillac Escalade, Chevrolet Camaro, Corvette, Silverado, Suburban and Tahoe as well as GMC Sierra and Yukon variants. Always cross-check part numbers and engine codes before purchase.

• Fits Cadillac Escalade & Escalade ESV 2015–2023 (V8 6.2L)
• Fits Chevrolet Camaro 2016–2020 and Corvette 2014–2019 (V8 6.2L)
• Fits Silverado and Sierra 1500 (2014–2023) 5.3L and 6.2L engines
• Also compatible with HD trucks and full-size SUVs including Suburban, Tahoe, Yukon lines

How do iridium and platinum combine to improve spark plug performance?

The center electrode uses iridium for a precise, wear-resistant tip while a platinum core adds structural stability and longevity. This dual-metal approach produces a fine-wire electrode that conducts reliably at high temperatures and resists erosion over long service intervals. The result is consistent ignition, easier starts and less frequent replacement versus standard copper plugs.

• Iridium tip for precise spark and superior wear resistance
• Platinum core for strength and longer electrode life
• Fine-wire design lowers voltage requirements for ignition
• Resists electrode degradation across extended mileage

What are the technical specifications I should know before installing?

These plugs are manufactured to specific dimensions and electrical resistance to match OEM expectations. Key specifications include a 0.044 in pre-set gap, 5/8 in hex size for standard sockets, 25 mm reach, and 14 mm thread diameter. They include a 5000-ohm resistor to reduce radio frequency interference and help meet modern vehicle electronics requirements.

• Gap size: 0.044 inches (factory-set)
• Thread: 14 mm diameter, 25 mm reach, 53 mm insulator height
• Hex size: 5/8 inch for typical spark-plug sockets
• Resistance: 5000 ohms to suppress interference

How often should these spark plugs be replaced?

Iridium/platinum combination plugs are designed for long service life, but replacement interval depends on driving habits and engine condition. A practical guideline is to inspect or replace them between 80,000 and 100,000 miles, or sooner if there are signs of misfiring, rough idle, or difficulty starting. Regular tune-ups and using the correct torque on installation help preserve longevity.

• Recommended inspection/replacement: 80,000–100,000 miles
• Replace sooner if you experience misfires or poor starts
• Use correct torque and anti-seize practices while installing
• Follow vehicle manufacturer service intervals and diagnostics

Who is this for: These A-Premium iridium platinum spark plugs are aimed at owners and technicians of GM full-size trucks, SUVs and performance V8 cars who want an OEM-spec, long-life replacement. They suit anyone replacing all eight plugs in V8 engines — from DIY home mechanics to professional shops — seeking reliable ignition, reduced maintenance frequency and compatibility with modern vehicle electronics.