NGK
More Information for NGK 3857
{Alternate Inventory Numbers: R6725105}
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NGK 3857  
$31.99
Price
$0.00
Core
+ Sold in packs of 1x1
Pack
$31.99
Total
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NGK 3857 Specifications
Center Electrode Core MaterialCopper
Center Electrode Tip MaterialPlatinum
Electrical Terminal TypeNon-Removable Nut
Gap Size (IN).028
Ground ConfigurationSlant
Ground Electrode Core MaterialPlatinum
Ground Electrode Quantity1
Ground Electrode Tip DesignPin Type
Hex Size (IN)13/16
Insulator Height (mm)67.00
Manufacturer Heat Range11
Part NumberR6725-105
Reach (mm)21.5
Resistance (ohms)5000
Seat TypeFlat
Stock Number3857
Thread Diameter (MM)14.00
Racing; Pre-Set Gap: 0.028"
You'll have confidence knowing you have the World Leader in spark plug technology firing your way to victory! To withstand the severe conditions that occur in racing engines, NGK Racing Spark Plugs feature:
  • Electrode materials Many use precious metals such as platinum or gold/palladium for greater durability and lower voltage requirements.
  • Electrode configurations Fine-wire center electrodes provide better sparking and enhanced ignitability. Fine-wire ground electrodes further improve the ignitability of the plug.
  • Insulator configurations Special configurations are used for the insulator noses to improve throttle response.
NGK Spark Plugs can be found in every racing venue throughout the world. Whether you're a weekend warrior or an accomplished racer NGK Spark Plugs is sparking winners.

This spark plug is pre-gapped, but may require minor adjustments with a Spark Plug Gap Tool / Feeler Gauge to match your engine's specifications. For proper engine performance, gaps should be within ±0.004" of OE-Recommended value.
Which NGK Spark Plug Is Right For You?

Material / Series Lifespan / Durability Performance / Ignitability Efficiency / Fuel Economy
Copper / Nickel V-Power
Copper
Platinum G-Power
Platinum
★★ ★★★★
Double Platinum Laser
Double Platinum
★★★★★ ★★ ★★
Iridium IX
Iridium IX
★★★ ★★★★★ ★★
Iridium Laser
Iridium Laser
★★★★★★ ★★★★ ★★★
Ruthenium HX
Ruthenium
★★★★★★★ ★★★★★ ★★★★
Videos

Check, Set & Adjust Spark Plug Gaps


Warranty Information:
60 Days