NGK 6855 Spark Plug

NGK V-Power Spark Plug 6855 Overview

NGK V-Power Spark Plug 6855 is a copper-core, nickel-tipped spark plug built for stable ignition performance and consistent combustion. It uses a 14 mm thread, flat seat, 0.75 in. reach, and a 0.044 pre-gap size for applications that call for this specification.

The V-Power design is part of NGK’s spark plug line focused on dependable OE-style ignition service for domestic and import vehicles, including many Honda Civic and Toyota Corolla applications where the correct heat range and terminal style matter.

Key Features

• NGK V-Power Spark Plug, part number 6855
• Part number ZFR7F-11 for OE-style replacement matching
• Copper center electrode core with nickel center electrode tip
• Nickel ground electrode with standard ground configuration
• 5,000 ohm resistance for ignition system compatibility
• Manufacturer heat range 7
• Flat seat, 14.00 mm thread diameter, 0.75 in. reach
• 5/8 in. hex size and non-removable nut terminal
• Pre-gapped to .044 in.

Detailed Description

NGK 6855 is a V-Power spark plug engineered for vehicles that require a 14 mm, flat-seat plug with a 0.75 in. reach and a 5/8 in. hex. The copper core helps transfer heat efficiently, while the nickel center and ground electrode materials support reliable spark delivery in everyday driving conditions. If you are searching for an NGK spark plug for Honda Civic or Toyota Corolla service, this part number is a direct reference point for the correct ignition specification.

NGK has long supplied original equipment spark plugs for domestic and import vehicles in North America, and this plug reflects that OE-focused approach. The 5,000 ohm resistor value, standard ground design, and .044 in. pre-gap make it a practical choice for maintenance on engines that call for this exact configuration. This part cross-references Bosch 7413 and Anchor 3320 for the same application.

Common Issues This Part Can Address

• Hard starting caused by worn spark plug electrodes
• Rough idle from inconsistent ignition firing
• Misfire conditions tied to plug wear or incorrect gap
• Reduced fuel economy from weak spark output
• Loss of throttle response from degraded ignition performance

Installation Notes and Tips

Verify the engine calls for a 14 mm, flat-seat spark plug with 0.75 in. reach, 5/8 in. hex, and .044 in. gap before installation. Check the existing plug condition, confirm the heat range matches the engine specification, and inspect ignition components for wear if misfire symptoms are present. Use the vehicle service manual for torque and service interval guidance.

For fitment-focused searches, this NGK 6855 spark plug is commonly referenced for Honda Civic and Toyota Corolla maintenance where the listed plug dimensions match the engine requirement.

Quality Assurance

NGK is a major OE spark plug supplier with decades of automotive manufacturing experience and a broad North American vehicle coverage base. The brand’s OE-oriented production standards and distribution network support consistent product quality for ignition service.