NGK 3623 BPR6EFS Standard Spark Plug.

NGK's Standard Plugs are Constructed for Longer Life and Optimum Performance.

Fits Indmar, Marine Power, Mercruiser, OMC, Redline, and Vovlo Penta inboards engines and Boston Whaler jet boat engines.

Specifications:
Shell

Thread Size: 14mm

Thread Pitch: 1.25mm

Seat Type: Tapered

Resistor: Yes

Resistor Value: 5K Ohm

Reach: 18mm (.709")

Hex Size: 5/8" (16mm)

Terminal Type: Removable Nut

Overall Height: ISO

Gap: .031" (0.8mm)

Center Electrode

Material: Nickel

Type: Standard

Size: 2.5mm

Projection: Projected

Ground Electrode

Material: Nickel

Type: Standard

Quantity: 1

Torque Specs: Cast Iron: 18-25.3 lb. ft. Aluminum: 18-21.6 lb. ft.

Brand: NGK

Heat Range: 6

Longevity: 30k Miles