IFATRUNK Iridium Spark Plugs 8-Pack for GM & Ford V6/V8 1988–2010 — Laser‑Welded, Long‑Life 0.4–0.6mm Electrode

IFATRUNK Iridium Spark Plugs 8 Pack delivers a durable, high-precision ignition solution made with a laser-welded iridium central electrode to improve spark focus and longevity for many V8 and V6 gasoline engines from 1988–2010.

These eight replacement spark plugs are engineered for late‑20th and early‑21st century American V6 and V8 engines across Chevrolet, Ford, GMC, Cadillac, Buick, Lincoln, Mercury and related platforms. The iridium-alloy center electrode (0.4–0.6 mm diameter) and laser welding increase wear resistance and maintain a sharp spark tip for more reliable starts, stable idling, and consistent combustion across a wide range of operating conditions. The pack is sold as eight plugs and matches several factory reference numbers including 7164, TR55IX, 3951, TR55, 3403 and TR55GP.

Which vehicles and engines are these spark plugs compatible with?

Compatibility covers many GM and Ford models built between the late 1980s and 2010, especially common V8 platforms. Confirm year, engine size and factory plug reference when ordering.

• Chevrolet: Silverado 1500/2500/3500, Avalanche 2500, Express vans, Camaro, Corvette, Impala, C/K series (C1500, C2500, C3500), Kodiak/GMC C4500–C6500
• Ford: F-150, F-250 Super Duty, Expedition, Explorer (selected V8s), Mustang (V8 1993–2004), E-450 Super Duty
• Cadillac & others: DeVille, Seville, Eldorado, Fleetwood, Escalade plus Lincoln Town Car, Aviator and Mercury Grand Marquis/Marauder
• Engine sizes: broadly covers 4.1L through 8.1L V6/V8 gasoline engines listed by manufacturers

How do these iridium plugs affect starting, fuel economy, and performance?

Iridium’s fine electrode concentrates spark energy into a smaller point, improving ignition reliability—especially during cold starts or lean mixtures. That focused spark can create more consistent combustion, which helps steady idling and can modestly improve throttle response and fuel efficiency compared with worn or lower‑grade plugs.

• Better cold-weather starts due to concentrated spark energy
• More stable ignition with lean or high-speed operation
• Potential for reduced misfires and smoother idle
• Laser-welded electrode for longer tip life versus conventional plugs

What are the construction and reliability features of IFATRUNK iridium plugs?

These plugs use an iridium-alloy center electrode with a fine diameter (0.4–0.6 mm) secured by laser welding. The design prioritizes electrode durability and thermal/electrical wear resistance while keeping the spark gap stable over longer service intervals.

• 0.4–0.6 mm iridium center electrode for concentrated spark
• Laser welding improves mechanical and thermal joint strength
• Manufactured to match several OEM reference numbers for fitment
• Sold as an 8‑piece set — suitable for most V8 replacement jobs

What’s included with the purchase and how do I handle support or returns?

The package contains eight IFATRUNK automotive replacement iridium spark plugs, suitable for replacing a full cylinder bank on most V8 engines. IFATRUNK provides customer support if you encounter fitment issues or defects; always verify part numbers and engine compatibility before installation.

• Includes: 8 IFATRUNK iridium spark plugs
• Support: customer assistance available for fitment or product issues
• Installation: torque to manufacturer specifications and check gaps if required
• Recommendation: confirm OEM reference numbers listed in product specs

Who is this for? Mechanics, DIY enthusiasts and fleet owners who service older GM and Ford V6/V8 gasoline engines will find this IFATRUNK 8‑pack useful when replacing worn plugs or upgrading to a longer‑lasting iridium option. If you need a full set for a V8 vehicle from the compatibility list (Chevrolet, Ford, GMC, Cadillac, Lincoln, Mercury and related models built roughly 1988–2010), these plugs offer a balance of durability, focused ignition performance, and straightforward fitment when matched to the proper engine and OEM reference.