NGK 5657 R5674-8 Racing Spark Plug

NGK Racing Series plugs are engineered to withstand the harshest engine conditions. Special insulator nose configurations improve throttle response. Corrugated ribs prevent flashover. Pure alumina silicate ceramic insulator, provides superior strength and better heat transfer. Copper core aids in heat removal. Triple seals prevent leakage.

Shell

Thread Diameter: 14mm
Thread Pitch: 1.25mm
Seat Type: Tapered
Reach: 11mm (7/16")
Hex Size: 5/8" (16mm)
Terminal Type: Solid
Overall Height: ISO
Gap: .020" (0.5mm)

Center Electrode

Material: Nickel
Type: V-Cut
Size: 2.5mm
Projection: Projected

Ground Electrode

Material: Nickel
Type: Standard

Specifications

Resistor: No
Resistor Value: 1K Ohm
Heat Range: 8
Torque Specs: Cast Iron: 10.8-18 lb. ft. Aluminum: 7.2-14.5 lb. ft.

• Mfg Part No: 5657 R56748
• Related Part No: 5657 R56748