NGK Spark Plug 3323 (AR6FS) - Standard Copper Core Plug for Crusader, Indmar, Berkeley I/O Engines

The NGK Spark Plug 3323 (NGK plug designation AR6FS) is a standard nickel-plated spark plug built with a solid copper core center electrode for strong heat dissipation, reliable conductivity, and a broad heat range. This construction has made NGK Standard plugs an OE cornerstone in marine and industrial engines for decades, and the 3323 carries that same proven design forward as a dependable, factory-style replacement rather than a generic substitute.

Both the ground electrode and the center electrode tip are nickel, while the center electrode core is copper, and the plug uses a standard ground electrode configuration with 5000 ohms of resistance to help suppress ignition noise. The corrosion-resistant plating on the plug body keeps installation and removal easy even after years of service in a marine engine bay.

The NGK 3323 is used across a range of applications, including Dodge and Ford engines, and marine I/O engines from Berkeley, Crusader, Indmar, and OMC, along with generator applications from Hobart, Ford commercial and industrial engines, farm equipment, and lift trucks from Clark, Ford, Osco, Tow Motor, and Yardster. Always check your engine and maintenance manual to confirm the correct spark plug for your specific application before ordering, since using the wrong plug can reduce performance, hurt fuel economy, or damage the engine.

Specifications

• Brand: NGK
• Manufacturer Part Number: 3323
• NGK Plug Designation: AR6FS
• Resistance: 5000 ohms
• Ground Electrode Configuration: Standard
• Ground Electrode Core Material: Nickel
• Center Electrode Core Material: Copper
• Center Electrode Tip Material: Nickel
• Weight: 0.15 pounds
• Package Dimensions: 3.58 x 1.1 x 0.79 inches (L x W x H)
• UPC: 087295133231

Fitment

• Dodge, model years 1993-64
• Ford, model years 1977-57
• I/O - Berkeley, 1977-1974
• I/O - Crusader, 1975-1974
• I/O - Indmar, 1987-1983
• I/O - OMC, 1974
• Generator - Hobart
• Commercial/Industrial - Ford
• Farm - Various
• Lift Trucks - Clark, Ford, Osco, Tow Motor, Yardster

Replaces (OEM)

• FORD%1120822

Frequently Asked Questions

What engines does the NGK 3323 spark plug fit? The NGK 3323 (NGK designation AR6FS) fits Dodge and Ford engines, marine I/O applications from Berkeley, Crusader, Indmar, and OMC, generator applications from Hobart, Ford commercial and industrial engines, farm equipment, and lift trucks from Clark, Ford, Osco, Tow Motor, and Yardster. Always confirm against your engine and maintenance manual before ordering.

Is there an OEM equivalent number for this NGK plug? Yes, the NGK 3323 cross-references to Ford OEM number FORD%1120822.

What is the electrode material on the NGK 3323? The NGK 3323 uses a copper center electrode core with a nickel center electrode tip, and a nickel ground electrode core, in a standard ground electrode configuration.

How much does the NGK 3323 spark plug weigh? The NGK 3323 weighs 0.15 pounds.

What are the package dimensions of the NGK 3323? The NGK 3323 ships in packaging measuring 3.58 x 1.1 x 0.79 inches (L x W x H).

What is the electrical resistance of the NGK 3323? The NGK 3323 has a resistance of 5000 ohms, which helps suppress ignition noise.

Is the NGK 3323 corrosion resistant? Yes, the NGK 3323 is treated with corrosion-resistant plating, which keeps installation and removal easy over the life of the plug.

Is the NGK 3323 a genuine NGK part or an aftermarket copy? The 3323 is a genuine NGK Standard spark plug, described by NGK as an OE cornerstone with a solid copper core, not a generic aftermarket substitute.

What comes in the box with the NGK 3323? Each order includes one NGK 3323 (AR6FS) spark plug.

Does the NGK 3323 fit Crusader marine engines? Yes, the NGK 3323 is listed as fitting Crusader I/O engines from 1975-1974, in addition to Berkeley, Indmar, and OMC I/O applications.

How do I know if the NGK 3323 is the correct plug for my engine? Check your engine and maintenance manual for the spark plug specified by your engine's original equipment manufacturer before installing the NGK 3323, since using the wrong plug can reduce performance, hurt fuel economy, or damage the engine.

What ground electrode design does the NGK 3323 use? The NGK 3323 uses a standard ground electrode configuration rather than a projected or multi-electrode design.