IFATRUNK Iridium Spark Plugs 6-Pack for V6 3.0L–4.3L Engines — Laser-Welded Iridium Tips, OE Fit

IFATRUNK Iridium Spark Plugs 6 Pack delivers a laser-welded iridium tip for concentrated ignition energy and improved durability across a wide range of V6 3.0L–4.3L engines.

These six premium replacement spark plugs are engineered to match OE fit and heat range for many Chevrolet, Ford, Buick, GMC, Pontiac and Mazda V6 engines (3.1L–4.3L). Each plug features a fine iridium central electrode welded with laser technology for high wear resistance and consistent spark performance. They are sold as a set of six and cross the common reference numbers 7164, TR55IX, 3951, TR55, 3403 and TR55GP, making them a versatile choice for tune-ups and routine maintenance.

Which vehicles and engines will these IFATRUNK plugs fit?

These plugs are compatible with numerous late‑model and older V6 applications from GM and Ford as well as some Mazda and Mercury models. Check the listed model-year ranges and engine displacements to confirm fitment for your specific vehicle.

• Chevrolet: Silverado, Express, S10, Blazer, Impala, Camaro, Malibu, Equinox, Astro, Venture, C1500/K1500, Monte Carlo (3.1L–4.3L ranges)
• Buick/Pontiac/GMC/Cadillac: Century, Regal, LeSabre, Lucerne, Allure, LaCrosse, Bonneville, Grand Prix, Jimmy, Sierra, Sonoma (V6 3.1L–4.3L)
• Ford/Mazda/Mercury: Escape, Explorer, Mustang, F150/Ranger, Five Hundred, Fusion, Freestyle, Tribute, Sable (V6 3.0L–4.2L)
• Cross-reference numbers: 7164, TR55IX, 3951, TR55, 3403, TR55GP for quick confirmation

How do iridium electrodes improve performance and longevity?

Iridium is a very hard, high‑melting-point metal that lets manufacturers use a much thinner central electrode. The reduced diameter concentrates the spark, which helps with cleaner combustion and more reliable ignition under varied conditions. Laser welding secures the iridium tip, minimizing electrical and thermal wear for longer service intervals compared with conventional plugs.

• 0.4–0.6 mm iridium electrode for a precise, focused spark
• Laser-welded construction for higher resistance to wear and heat
• Improved cold starts and stable ignition at high RPMs or lean mixtures

What should I expect when installing these plugs?

Installation follows standard spark plug service procedures: remove old plugs, inspect the ignition system, gap if necessary per manufacturer specs, and torque to the vehicle maker’s recommendation. Because these IFATRUNK plugs use common reference numbers and OE-style threads, installation is straightforward for anyone with basic tools and mechanical knowledge.

• Sold as a 6-pack—enough for most V6 cylinder banks
• Verify gap and torque settings against the vehicle service manual
• Inspect wires/coils and apply anti-seize or dielectric grease only where recommended

Will these spark plugs affect fuel economy or drivability?

By producing a more concentrated and stable spark, iridium plugs can help the engine ignite fuel more efficiently across operating conditions. While results vary by vehicle and maintenance history, users commonly notice smoother idling, crisper throttle response and more consistent starts.

• More stable combustion can reduce misfires and rough idles
• Potential for improved throttle response and transient acceleration
• May contribute to optimized fuel use when paired with good engine tune

Who is this for: IFATRUNK Iridium Spark Plugs 6 Pack is aimed at DIY mechanics, professional technicians and vehicle owners with V6 3.0L–4.3L engines who want a durable, OE-compatible replacement that balances long life with reliable ignition. If you require a set that replaces common reference numbers like 7164 or TR55IX and fits popular GM and Ford V6 applications, this kit offers a cost-effective upgrade with laser-welded iridium tips and full customer support from IFATRUNK.