Newparts NGK Iridium IX Spark Plugs Set — 16-Pack for Chrysler Dodge Jeep Ram 5.7L/6.4L V8, Iridium Tips & Copper Core

Newparts supplies a complete set of 16 NGK Iridium IX spark plugs engineered as direct replacements for Chrysler, Dodge, Jeep and Ram 5.7L and 6.4L V8 engines.

These NGK Iridium IX spark plugs arrive in a 16-piece kit that matches the factory thread, reach and seat type used on many modern HEMI V8 engines. Each plug uses an iridium-tipped center electrode with a copper core and a standard ground electrode in a gasket-seat design. The set is sold under the Newparts listing and ships with original NGK packaging and hardware so you can install them as direct swaps.

Which engines and model years do these spark plugs fit?

These plugs are specified for Chrysler, Dodge, Jeep and Ram V8 engines where NGK part specifications match the factory plug. They are commonly used in 5.7L and 6.4L HEMI V8 applications across a broad range of model years. Always verify fitment against your vehicle’s service manual or the seller’s confirmed-fit tool before purchase.

• Compatible with Ram 1500 2011–2024 5.7L V8 (verify individual listings for 6.4L coverage)
• Thread diameter: 0.551 in; reach: 26.5 mm; insulator height: 50.5 mm
• Gasket-seat design and 5/8" hex for standard installation tools
• Manufacturer heat range: 5, pre-gap: 0.044 in, resistance: 5000 Ω

How do NGK Iridium IX plugs differ from standard spark plugs?

Iridium IX plugs use a fine iridium tip on the center electrode, which provides a smaller firing projection and higher melting point than conventional nickel tips. That design promotes more consistent spark delivery and can support stable ignition under a wider range of temperatures and loads. The copper core helps conduct heat away from the electrode quickly, supporting reliable operation in V8 performance engines.

• Iridium center tip for a thin, durable firing point
• Copper core for efficient thermal transfer
• Taper-cut ground electrode for focused spark dispersion
• Factory-matching dimensions for bolt-in replacement

What should I know about installation and maintenance?

Installation requires basic hand tools: a 5/8" socket, torque wrench and anti-seize or appropriate thread lubricant only if recommended by the vehicle manufacturer. Use the specified gap of 0.044 inches and torque to the vehicle maker’s value to avoid damage. Replace coils or plug wires as needed and inspect for oil, coolant leaks or other issues that could shorten plug life.

• Pre-gap: 0.044 in — check before installation
• Hex size: 5/8" for standard spark-plug sockets
• Replace in sets to maintain consistent ignition timing across cylinders
• Follow OEM torque specs to protect threads and sealing surface

Are these genuine NGK parts and what does the package include?

The Newparts listing supplies genuine NGK Iridium IX spark plugs in original NGK packaging. You receive all 16 plugs plus any manufacturer-supplied hardware so you can perform a full V8 tune-up in a single service. The product is marketed as a direct replacement for original equipment plug dimensions and materials.

• Quantity: 16 NGK Iridium IX spark plugs per kit
• Original NGK packaging and manufacturer hardware included
• Sold as direct replacement parts — check Amazon Confirmed Fit for your vehicle

Who is this for: This 16-pack is intended for owners and technicians maintaining Chrysler, Dodge, Jeep or Ram trucks and SUVs with 5.7L or 6.4L V8 engines who want OEM-matching NGK Iridium IX plugs for a complete tune-up. It’s suitable for fleet service bays, DIY mechanics replacing all eight plugs and anyone seeking original NGK parts packaged for immediate installation. Always confirm vehicle compatibility before ordering to ensure proper fit and performance.