A-Premium Iridium Platinum Spark Plugs Pack of 6 for V6 4.2L/4.3L Engines — Fine Wire, Pre-Gapped 0.044in

These fine-wire spark plugs from A-Premium are engineered to replace OE-style plugs across a wide range of GM and compatible vehicles. Featuring an iridium center electrode tip and a platinum core, this six-piece set balances durability with consistent spark delivery. The plugs come pre-gapped at 0.044 inches where applicable, with a 14 mm thread diameter, 25 mm reach and a 5/8-inch hex for straightforward installation.

Which vehicles will these spark plugs fit?

These A-Premium plugs are designed to match OE specifications for many GM and related V6 models. Fitment includes Silverado and Sierra pickup models, Express and Savana vans, Trailblazer and Envoy SUVs, plus Saab 9-7x and older Bravada models. Always cross-check your vehicle’s part number list or service manual to confirm compatibility.

• Compatible with Silverado 1500 2014–2021 V6 4.3L and Sierra 1500 equivalents
• Fits Chevrolet Express 2500/3500 and GMC Savana 2500/3500 V6 4.3L (2018–2020)
• Compatible with Buick Rainier, Trailblazer, Envoy, Isuzu Ascender and Saab 9-7x L6 4.2L variants
• Reference numbers include 91418, ILTR5E11, 12598004, 12622441, 12625058, 3474

What are the key specifications and materials?

A-Premium combines iridium and platinum to improve electrode longevity while maintaining a sharp spark. The plugs feature a fine wire iridium tip on a platinum core, a 5000-ohm resistor to reduce electrical interference, and dimensions that match factory replacements. These specifications help ensure proper seating, heat range, and reach for compatible engines.

• Center electrode tip: Iridium; core material: Platinum
• Resistance: 5000 ohms; Gap set at 0.044 inches where specified
• Thread diameter: 14 mm; Reach: 25.00 mm; Insulator height: 53.00 mm
• Hex size: 5/8 inch for common socket fit

How long can I expect these spark plugs to last and when to replace them?

Iridium and platinum electrodes are chosen for wear resistance and long service intervals. A-Premium recommends replacement intervals near typical industry guidance for these materials; check your driving conditions and diagnostics for early signs of wear. Routine inspection during service intervals helps catch fouling or electrode erosion before performance is affected.

• Suggested replacement interval: approximately 80,000–100,000 miles under normal conditions
• Inspect earlier if experiencing misfires, rough idle, or increased fuel use
• Use correct torque and gap specifications during installation to avoid damage

Are these plugs easy to install and are they a direct replacement?

Yes — the A-Premium pack is made to match factory thread size and reach so they act as direct replacements for listed applications. The 5/8-inch hex fits standard spark plug sockets and the plated threads aid installation and corrosion resistance. Always follow manufacturer torque specs and anti-seize guidance when installing to protect threads and maintain correct heat transfer.

• Direct-replacement form factor for listed GM and related V6/L6 engines
• 5/8-inch hex for standard socket use and easy hand or shop installation
• Pre-set gap (0.044") for many applications—verify against vehicle spec before final fit

Who is this for: A-Premium Iridium Platinum Spark Plugs are intended for vehicle owners, independent mechanics, and fleet managers who need OE-style, long-life plugs for V6 4.2L and 4.3L engines. They suit drivers seeking a durable replacement that matches factory dimensions and offers extended service intervals, while technicians will appreciate the standard hex size and resistance rating for reliable electrical performance.