NGK 3522 Spark Plug

NGK BR6S Standard Spark Plug

The NGK BR6S standard spark plug is built for OE-style ignition performance in a wide range of classic domestic applications. With a copper center electrode core, nickel tip materials, and a 5,000 ohm resistor, it supports stable spark delivery and consistent combustion in older Chevrolet, GMC, Jeep, and Pontiac engines.

As part of NGK’s Standard Spark Plug line, this plug reflects the brand’s long OE supply background and focus on original-equipment dimensions, durability, and dependable operation. The NGK 3522 is a practical replacement choice for drivers servicing vintage vehicles that call for a flat seat, 14 mm thread, and .375 reach.

Key Features

• NGK Standard Spark Plug line for OE-style replacement
• Part number 3522 / BR6S
• 5,000 ohm resistor for ignition noise suppression
• Copper center electrode core for reliable heat transfer
• Nickel center and ground electrode tip materials
• Standard ground electrode design with one ground electrode
• Pre-gapped at .028
• 14 mm thread diameter, .375 reach, flat seat
• 13/16 hex size with removable nut terminal
• Manufacturer heat range 6

Detailed Description

The NGK BR6S is a conventional spark plug designed around original-equipment specifications for older engines that require a standard copper/nickel construction. Its 5,000 ohm resistance helps control electrical interference, while the flat seat and .375 reach support proper cylinder head fitment in applications such as Chevrolet Bel Air, Corvette, El Camino, Impala, Monte Carlo, and Jeep CJ5. The NGK 3522 is also listed for several GMC van and Jimmy applications, along with Pontiac Parisienne, LeMans, and Tempest coverage.

This part cross-references Champion Spark Plug 102 for the same application.

Used For

• Restoring weak or inconsistent spark in older ignition systems
• Replacing worn plugs that cause rough idle or misfire
• Addressing hard starting in classic Chevrolet, GMC, Jeep, and Pontiac engines
• Maintaining OE-style ignition performance in vintage vehicles
• Supporting proper combustion when factory-style plug dimensions are required

Installation Notes and Tips

Verify thread diameter, reach, seat type, and heat range before installation. The BR6S is pre-gapped at .028, but the gap should still be checked against the vehicle’s service specification before use. Confirm the removable nut terminal matches the ignition wire end, and inspect the plug wires, cap, and coil condition during service. For fitment examples, this plug fits 1972-1973 Jeep CJ5, 1968-1970 Chevrolet Blazer, and 1953-1965 Chevrolet Corvette, N/A.

Quality Assurance

NGK is a major OE spark plug supplier with decades of automotive manufacturing experience and broad coverage across domestic and import applications. The BR6S is produced to support original-equipment standards for durability and consistent engine operation.