IFATRUNK Iridium Spark Plugs 6 Pack for 3.1L–4.3L V6 Engines — Iridium-Tipped, OE-Style Fit

IFATRUNK Iridium Spark Plugs 6 Pack are high-durability replacement spark plugs engineered to restore reliable ignition for many 3.1L–4.3L V6 engines across Chevrolet, Ford, Buick, GMC, Pontiac, Mazda and related models.

These six iridium-tipped plugs are manufactured with a fine central electrode and laser-welded construction to withstand thermal and electrical wear while concentrating spark energy for consistent ignitions. They are sold as a set of six, matching OE-style thread and reach specifications for a broad range of V6 gasoline engines from the mid-1980s through the early 2010s. The plugs are offered as compatible replacements for reference numbers such as 7164 and TR55IX and are designed for customers who want an affordable, long-life ignition solution without modifying their engine setup.

Which vehicles and engines will these spark plugs fit?

IFATRUNK iridium plugs cover an extensive compatibility list spanning multiple brands and model years, especially V6 applications with 3.0L–4.3L displacements. They’re intended as direct-fit replacements where the OEM used the same thread size, reach and heat range referenced by the listed part numbers.

• Chevrolet: Silverado, Express, S10, Blazer, Impala, Camaro, Malibu, Equinox, Astro, Monte Carlo and more (3.1L–4.3L V6 ranges).
• Buick / Pontiac / GMC / Cadillac: Century, Regal, LeSabre, Lucerne, Bonneville, Grand Prix, Sierra, Jimmy, C1500/S1500 series and related V6 models.
• Ford & Mercury: Escape, Explorer, Mustang, Ranger, Taurus, Fusion, Five Hundred, Freestyle and other V6 applications noted in compatibility listings.
• Mazda: Tribute and compatible V6 models; also fits select Mercury and Ford cousins sharing the same V6 platforms.

How do these iridium plugs improve ignition and performance?

Their fine iridium center electrode (around 0.4–0.6 mm) creates a concentrated spark that promotes faster and more complete combustion compared with larger, worn electrodes. That focused spark helps the engine fire more consistently under a variety of conditions, which can aid drivability and throttle response without changing engine tuning.

• Laser-welded iridium tip provides higher resistance to electrode erosion and longer service life.
• Smaller electrode gap improves spark precision for better ignition stability at startup and under load.
• Designed to match OE thread and reach for straightforward installation—no engine modifications required.

What should I expect during installation and routine maintenance?

Installation follows standard spark plug replacement steps: remove old plugs with the correct socket, confirm gap if necessary, torque to manufacturer specs and replace ignition boots or coils as needed. These plugs are supplied as a set of six, so they’re suitable for complete V6 tune-ups and routine maintenance cycles.

• Check engine manufacturer torque specs and plug gap before installation.
• Replace in matched intervals—inspect boots, wires and coils at the same time to ensure optimal performance.
• Included support: IFATRUNK customer service is available if you encounter fitment or quality questions.

Are these plugs equivalent to the OEM reference numbers listed?

These IFATRUNK spark plugs are cross-referenced to several common replacement numbers (including 7164 and TR55IX) and built to match the electrical and mechanical properties needed for those applications. Always verify part cross-reference and engine compatibility against your vehicle’s service manual or VIN to ensure a correct match.

• Cross-references include 7164, TR55IX, 3951, TR55, 3403 and TR55GP as common equivalents.
• Compatible with many model years—confirm engine displacement and plug thread/reach on your vehicle.
• Sold as a 6-pack—enough for a full V6 cylinder bank replacement.

Who is this for: This 6-pack suits DIY mechanics, fleet owners and independent shops looking for an affordable iridium replacement for V6 gasoline engines in older GM, Ford and select Mazda vehicles. It’s best for users who need a durable, direct-fit spark plug that improves ignition consistency without altering factory settings; however, always confirm fitment for your model year and engine code before purchase.