NGK 3323 Spark Plug

NGK Standard Spark Plug for OE-Style Ignition Performance

The NGK Standard Spark Plug, part number 3323, is built for drivers who want a direct-replacement ignition component with OE-style construction and dependable service characteristics. It uses a copper center electrode core, nickel center electrode tip, and nickel ground electrode tip for consistent spark delivery in everyday driving.

Compatible With 1960-1966 Ford F-100, F-250, F-350 and 1987-1989 Dodge D250, D350, W250, W350 applications, this NGK spark plug is also a fit for the 1966 Ford Bronco. The tapered seat, 18 mm thread diameter, 0.429 reach, and 0.036 pre-gap support straightforward replacement in the listed engines.

Key Features

• NGK Standard Spark Plug, part number 3323
• Copper center electrode core for stable conductivity
• Nickel center and ground electrode tips
• Standard ground electrode design with one ground electrode
• 5000 ohm resistance
• 0.036 pre-gap size
• Tapered seat with 18 mm thread diameter
• 13/16 hex size for common spark plug service tools
• Manufacturer heat range 6

Product Details

NGK’s Standard Spark Plug line focuses on OE-style replacement parts built to original equipment standards for durability and consistent operation. Part number 3323 follows that approach with a conventional electrode layout, non-removable nut terminal, and standard configuration that suits routine maintenance on older Ford and Dodge trucks. This part cross-references Champion Spark Plug (e.g., 129, 344) for the same application.

Common Issues This Spark Plug Can Address

• Hard starting caused by worn or fouled spark plugs
• Rough idle from weak or inconsistent spark output
• Misfire concerns related to aged ignition components
• Reduced throttle response from degraded plug performance
• Maintenance replacement for service intervals on listed Ford and Dodge applications

Installation Notes and Tips

Verify the engine application before installation and confirm the specified gap for your vehicle. For the listed fitments, use the OE-referenced gap noted in the vehicle data and inspect plug wires, distributor components, and ignition timing during service. The tapered seat design should be matched to the cylinder head specification, and the 13/16 hex size supports standard removal and installation tools.

Quality Assurance

NGK is a long-established OE spark plug supplier with broad coverage across domestic and import vehicle applications in North America. The brand manufactures ignition components to original equipment standards and supports automotive service with established production and distribution capabilities.