NGK 5866 Spark Plug

NGK BR5ES Standard Spark Plug

The NGK BR5ES standard spark plug is built for dependable ignition performance in a wide range of older import and domestic applications. It uses a copper center electrode core, nickel center and ground electrode tips, and a 5,000 ohm resistor to support stable spark delivery and reduced electrical noise.

As part of NGK’s Standard Spark Plug line, this plug follows an OE-style design focused on original-equipment fit and consistent operation. It is a practical choice for drivers servicing vehicles such as the Volkswagen Vanagon, Chevrolet Blazer, and Chevrolet Corvette with the specified factory-style plug requirements.

Key Features

• NGK part number 5866 / BR5ES
• Standard spark plug design with OE-equivalent construction
• Copper center electrode core for reliable heat transfer
• Nickel center and ground electrode tip materials
• 5,000 ohm resistor for ignition system noise suppression
• Pre-gapped at .036 inch
• 14 mm thread diameter, .75 inch reach, flat seat
• 13/16 inch hex size with removable nut terminal

Product Details

The BR5ES is engineered with a standard ground configuration, one ground electrode, and a manufacturer heat range of 5. Its OE-style dimensions and flat-seat design make it suitable for applications that call for a conventional spark plug with a .036 inch pre-gap and 14 mm thread size. NGK’s long history as an OE supplier and ignition specialist supports the product’s focus on durability, consistent performance, and original-equipment standards.

This part cross-references Champion Spark Plug 406 and Autolite 405 for the same application.

Common Uses

• Restoring weak or inconsistent spark output
• Addressing rough idle caused by worn plug electrodes
• Replacing fouled plugs during tune-up service
• Correcting misfire concerns tied to aged ignition components
• Maintaining factory-style ignition performance in older vehicles

Installation Notes

Verify the required heat range, thread diameter, reach, seat type, and gap before installation. Confirm the vehicle’s specified plug gap and adjust only if needed for the application. For fitment, this plug is listed for 1980-1983 Volkswagen Vanagon, 1969 Chevrolet Blazer, and 1969 Chevrolet Corvette; the Corvette application notes aluminum heads and a 0.035 inch gap, while the Vanagon application notes a 0.028 inch gap with OE-equivalent design.

Fits 1980-1983 Volkswagen Vanagon, N/A. Fits 1969 Chevrolet Blazer, N/A. Fits 1969 Chevrolet Corvette, N/A.

Quality Assurance

NGK manufactures spark plugs for domestic and import vehicles, motorcycles, marine engines, and small engine applications, with North American OE-focused production and distribution support. The BR5ES reflects that OE legacy with a conventional design intended to meet original-equipment standards for durability and operational consistency.