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Genuine NGK BU8H Spark Plugs Non Resistor 6431 (6 Pack) Surface Discharge Type

  • Based on 5 reviews
Condition: New
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Availability: In Stock.
Fulfilled by Amazon

Arrives Wednesday, Dec 31
Order within 20 hours and 12 minutes
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Features

  • Research Applications Prior to Purchase To Make Sure This OEM Part Fits Your Application
  • Often specified as original equipment, NGK spark plugs are the best combination of performance and longevity.
  • NGK is the world's largest supplier of OEM spark plugs
  • NGK spark plugs are designed for easy installation, saving you time and effort
  • Offering the Quality, Reliability and Durability You'd Expect from an OEM Manufacturer

Description

NGK 6431 BU8HSurface gap plugs are nearly immune to pre-ignition, and usually require a special high energy ignition system. They can be susceptible to fouling, especially in colder applications, but may be necessary in high compression applications.Trivalent metal plating provides superior anti- corrosion and anti-seizing propertiesCorrugated ribs prevent flashoverPure alumina silicate ceramic insulator, provides superior strength and better heat transferCopper core aids in heat removalTriple seals prevent leakageShell Thread Diameter: 14mm Thread Pitch: 1.25mm Seat Type: Gasket Reach: 12.7mm (1/2") Hex Size: 13/16" (21mm) Terminal Type: Solid Overall Height: ISO Gap: .016" (0.4mm)Center Electrode Material: Nickel Type: Standard Size: 2.5mm Projection: Non-ProjectedGround Electrode Material: Nickel Type: Surface DischargeSpecifications Resistor: No Resistor Value: 1K Ohm Heat Range: 8 Torque Specs: Cast Iron: 18-25.3 lb. ft. Aluminum: 18-21.6 lb. ft.

Brand: OVERSTOCKDIRECT


Core Material: Nickel


Thread Size: 14mm


Top Material Type: Ceramic


Automotive Fit Type: Universal Fit


Brand: ‎OVERSTOCKDIRECT


Core Material: ‎Nickel


Thread Size: ‎14mm


Top Material Type: ‎Ceramic


Automotive Fit Type: ‎Universal Fit


OEM Part Number: ‎Mercury Marine 33-13686B 2; Mercury Marine 33-13686Q; DENSO 6038; DENSO SF24; Champion 885M; Champion 886M; Champion QL6VC


Manufacturer: ‎OVERSTOCKDIRECT


Model: ‎NGK Spark Plug


Item Weight: ‎11.7 ounces


Product Dimensions: ‎5.04 x 3.46 x 1.06 inches


Item model number: ‎BU8H Solid


Manufacturer Part Number: ‎6431 BU8H


Date First Available: June 3, 2025


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Wednesday, Dec 31

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

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Leasing options through Acima may also be available during checkout.

Learn more about financing & leasing here.

Top Amazon Reviews


  • Outboard spark plugs
Worked great on my mercury 135 outboard.
Reviewed in the United States on September 18, 2025 by Junkyard junkie

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