OVERSTOCKDIRECT NGK Laser Iridium Spark Plugs LZFR5CI11 16-Pack — 5.7L HEMI OE Fit, Long-Life

These are a 16-pack of NGK LZFR5CI11 (stock 92145) Laser Iridium spark plugs engineered for 5.7L HEMI V8 engines that require OE-equivalent iridium performance and long service life.

If you maintain a Chrysler, Dodge, Jeep or Ram with the 5.7L V8 from model years roughly 2009–2024, these NGK Laser Iridium plugs match the OE specification and are sold as the LZFR5CI11 (92145) 16-pack. They combine an iridium-tipped fine-wire center electrode with a copper core and high-grade ceramic insulator to offer consistent ignition characteristics, factory-style fitment (flat seat, 14.0 mm thread, 26.5 mm reach) and a pre-set gap suitable for many OE ignition systems. Always cross-check the part number with your vehicle manual before installing.

Which vehicles and years use these LZFR5CI11 (92145) plugs?

These plugs are specified for many Chrysler-family vehicles equipped with the 5.7L V8. Compatibility covers Ram 1500/2500/3500, Charger, Challenger, 300, Durango, Grand Cherokee, Wagoneer and others across the 2009–2024 model span where the OEM calls for this NGK equivalent.

• Ram 1500/1500 Classic: 2009–2024 (selected years and trims with 5.7L V8)
• Charger, Challenger, 300, Durango, Grand Cherokee, Wagoneer: model years listed 2009–2024
• Matches OE references SP143877AA / SP143877AB / 68143877AB where specified

How are these spark plugs constructed and why does that matter?

NGK Laser Iridium plugs combine a fine-wire iridium center electrode with a copper core and high-purity ceramic to control heat, resist wear and maintain a stable spark gap. The iridium tip is harder than platinum and helps maintain performance over a longer interval, while the ceramic and copper core manage temperature and conductivity.

• Center electrode: iridium fine-wire for durable, consistent sparks
• Core: 98% pure copper for thermal conduction and reliable starts
• Insulator: high-grade alumina ceramic to resist overheating and fouling
• Resistor type with crush washer and 5/8" hex for OEM-style installation

What are the key specifications to confirm fitment?

Before installing, check the plug’s thread diameter (14.0 mm), reach (26.5 mm), seat type (flat), and pre-gapped size (0.044 in / 1.1 mm). These dimensions align with OE requirements for many 5.7L HEMI applications and help ensure proper seat and heat transfer.

• Thread diameter: 14.0 mm (0.551 in)
• Reach: 26.5 mm (1.043 in) and flat seat
• Pre-gap: 0.044 in (1.1 mm) — verify before installation
• Hex size: 5/8" (16 mm) and insulator height ~50.5 mm

What practical benefits can I expect from choosing NGK Laser Iridium?

These plugs are built to meet OEM performance goals: consistent ignition, controlled electrode wear, and extended service intervals compared with many conventional plugs. They’re designed for distributorless and coil-on-plug systems common to modern V8 engines, offering stable combustion behavior across driving conditions.

• Iridium tip for long-term wear resistance and stable spark delivery
• Copper core and ceramic insulator for thermal stability and reliable starts
• Manufactured to OEM-quality tolerances for fit and function
• Sold as a complete 16-pack for vehicles requiring full-plug replacement

Who is this for: owners and technicians servicing Chrysler, Dodge, Jeep and Ram vehicles with the 5.7L V8 who need an OEM-equivalent 16-pack of NGK Laser Iridium spark plugs (LZFR5CI11 / 92145). Ideal for full-plug replacement during routine maintenance or overhaul when OE specification, durable iridium tips and precise fitment are required. Always confirm vehicle part numbers and gap requirements before purchase and installation.