Description
The NGK 4323 BR6FS Nickel Spark Plug is a reliable OE-style replacement designed for marine and industrial engine applications. Built with a durable nickel alloy center electrode and a 98% pure copper core, this plug delivers consistent ignition performance, efficient heat dissipation, and dependable operation under demanding conditions.
Featuring a non-projected tip design and tapered seat, the BR6FS is well-suited for marine engines where durability and stable combustion are critical. NGK’s high-grade alumina silicate ceramic insulator enhances dielectric strength and heat transfer, while triple sealing prevents combustion gas leakage. Trivalent metal plating ensures resistance to corrosion and seizing, making installation and removal easier even in harsh marine environments.
Features:
- OE-style nickel alloy center electrode for reliable ignition
- Solid terminal design for secure connection
- 98% pure copper core for superior heat dissipation
- Non-projected tip for stable combustion in marine engines
- High-strength ceramic insulator for durability and heat transfer
- Triple gasket sealing prevents gas leakage
- Trivalent plating resists corrosion and seizing
- Ideal for marine and industrial applications
Specifications:
General
- Part Number: BR6FS
- Stock Number: 4323
- Heat Range: 6
- Resistor: Yes (5k Ohm)
- Gap: 0.8 mm (0.031")
- Electrode Type: Nickel
Shell
- Thread Size: M14 x 1.25
- Seat Type: Tapered
- Reach: 11.6 mm (0.460")
- Hex Size: 5/8" (16 mm)
- Terminal Type: Solid
Electrodes
- Center Electrode: Nickel, copper core
- Ground Electrode: Nickel
- Projection: Non-Projected
- Configuration: J-Gap
Fitment
Marine Applications (Common Engines)
Crusader
Indmar
- GM Small Block & Big Block V8
- GM 3.0L L4
- GM 4.3L V6 EFI
Kodiak
- 4.3L V6 (220 HP)
- 7.4L V8 (350 HP)
Marine Power
- 3.0L L4
- 4.3L V6
- 5.0L / 5.7L / 7.4L / 8.2L V8 engines
MerCruiser
- GM 2.5L / 3.0L L4
- GM V6 & V8 (Small Block & Big Block)
- Ford Small Block V8 (Inboard/Stern Drive)
Volvo Penta
- 5.7L, 7.4L, 8.2L engines
- Various AQ and Duoprop series engines
Yamaha Marine
- 3.0L L4
- V6 and V8 marine engines
Other
- OMC Stern Drive
- U.S. Marine engines (5.0L / 5.7L / 7.4L)
Performance Notes:
- Designed for marine and heavy-duty engine environments
- Non-projected tip helps prevent pre-ignition in certain applications
- Ideal replacement for engines originally using nickel spark plugs
- Not recommended for engines requiring platinum or iridium plugs
