NGK 2851 Spark Plug

NGK V-Power Spark Plug 2851 Overview

NGK 2851 is a V-Power spark plug built for OE-style ignition performance in a wide range of domestic and import applications. It uses a copper core center electrode, nickel center and ground electrode tips, and a standard ground configuration to support consistent spark delivery and reliable combustion.

With a 14 mm thread diameter, 0.75 in. reach, flat seat, 13/16 in. hex, and pre-gap set at 0.040 in., this NGK spark plug is a direct-service choice for vehicles that call for the GR5 heat range. It is a practical replacement for drivers servicing older Chevrolet, Pontiac, Ford, and GMC applications, including Chevrolet S10, Pontiac Sunbird, and Ford Pinto fitments.

Key Features

• NGK V-Power Spark Plug line for OE-style ignition service
• Part number 2851, also identified as NGK GR5
• Copper core center electrode for stable heat transfer
• Nickel center and ground electrode tip materials
• Standard ground electrode design with one ground electrode
• 5000 ohm resistance for suppression-style ignition systems
• Pre-gapped to 0.040 in. for service convenience
• 14 mm thread diameter, 0.75 in. reach, flat seat, 13/16 in. hex

Product Details

NGK is a major OE spark plug supplier in North America, and the V-Power line is positioned for dependable everyday ignition service across a broad vehicle range. Part number 2851 is engineered with a copper core and nickel electrode construction to support consistent firing characteristics and long-term service in applications that specify this plug design. This part cross-references Bosch 7501 and Autolite 64 for the same application.

Compatible fitment includes 1982-1984 Chevrolet S10, 1985 Chevrolet S10, 1983-1984 Chevrolet S10 Blazer, 1985-1987 Chevrolet Spectrum, 1988 Chevrolet Spectrum, 1985-1987 Pontiac Firefly, 1988 Pontiac Firefly, 1985-1987 Pontiac Sunburst, 1988 Pontiac Sunburst, and 1988-1990 Pontiac Sunbird. It also covers classic applications such as 1967 Chevrolet Camaro, 1969 Chevrolet Corvette, 1971-1976 Ford Pinto, and 1972-1979 Ford Courier.

Common Uses

• Replacing worn spark plugs that cause rough idle
• Restoring ignition performance after misfire or hesitation
• Addressing hard starting in older carbureted or EFI vehicles
• Correcting fouled plug symptoms from age or extended service intervals
• Servicing OE-equivalent ignition maintenance on Chevrolet, Pontiac, Ford, and GMC models

Installation Notes

Verify the required gap before installation and compare it to the vehicle service specification, since listed fitments include 0.030 in., 0.034 in., 0.035 in., 0.040 in., and 0.045 in. applications. Confirm thread diameter, reach, seat type, and hex size against the original plug before installation. Use the vehicle manufacturer’s torque specification and inspect ignition wires, coil condition, and plug wells during service.

Quality Assurance

NGK manufactures spark plugs for a broad range of automotive, motorcycle, marine, and small engine applications, with OE-focused production standards and North American distribution support. Part number 2851 is built to meet the dimensional and electrical requirements listed for the specified applications.