NGK 7355 Spark Plug

NGK Iridium IX Spark Plug 7355

NGK Iridium IX Spark Plug 7355 is built for drivers restoring or maintaining classic domestic performance and everyday street vehicles. It combines an iridium center electrode with a nickel ground electrode and a 0.040 pre-gap for consistent ignition performance in the correct applications.

Key Features

• Iridium center electrode tip material for precise spark delivery
• Copper center electrode core for efficient heat transfer
• Nickel ground electrode core with taper-cut tip design
• Standard ground configuration with one ground electrode
• 5000 ohm resistance for ignition system compatibility
• 14.00 mm thread diameter, 0.375 reach, flat seat
• 13/16 hex size and non-removable nut terminal
• Manufacturer heat range 5

Iridium IX Product Line

NGK Iridium IX spark plugs are part of NGK’s performance-focused ignition line, using an iridium firing tip to support stable spark characteristics and long service life in properly matched engines. Part number 7355, also referenced as XR5IX, is listed across a wide range of classic Chrysler, Dodge, Chevrolet, Pontiac, Buick, Oldsmobile, Cadillac, and GMC applications.

Detailed Description

As an ignition component from NGK, part number 7355 reflects the brand’s OE-supplier background and broad coverage for domestic and import vehicles. This spark plug is listed for applications such as 1967-1978 Dodge Charger, 1969-1970 Chevrolet Camaro, 1967-1969 Pontiac GTO, and 1958-1966 Cadillac DeVille, with fitment notes that vary by engine and required gap. Always verify the specified gap before installation, since some listed vehicles call for 0.035 inch, 0.030 inch, 0.040 inch, or 0.045 inch settings.

This part cross-references Gates 7355 for the same application.

What It Is Used For

• Restoring ignition performance on classic Dodge Charger and Chrysler 300 applications
• Replacing worn plugs that cause rough idle or misfire conditions
• Addressing hard starting in older Chevrolet Camaro, Corvette, and Impala engines
• Correcting spark loss from worn electrodes or excessive plug wear
• Maintaining proper combustion in vintage Pontiac GTO, Firebird, and LeMans engines

Installation Notes and Tips

• Confirm engine-specific fitment before ordering; listed vehicles include multiple gap requirements.
• Set the plug gap to the specification shown for the exact application before installation.
• Use the correct 13/16-inch spark plug socket and torque to the vehicle manufacturer specification.
• Inspect ignition wires, distributor components, and coil condition during service.
• Part number 7355 may also be referenced as XR5IX in catalog listings.

Quality Assurance

NGK is a long-established OE spark plug supplier with North American manufacturing, inventory, and distribution support. The brand’s focus on original equipment standards and broad vehicle coverage supports consistent product quality for service and restoration work.