Ngk V-Power Spark Plug Wr5 (8 Pack) For Ford Custom 1964-1971 6.4L/390

Ngk V-Power Spark Plugs Offer Economical Performance For Nearly Any Automotive Application-And They’Re The Only Plugs With Ngk’S V-Groove Technology. These Plugs Enhance Ignitability, Lower The Voltage Requirements Of Ignition Systems, And Have Strong Anti-Fouling Characteristics, While Improving Fuel Mileage And Acceleration Performance. The V-Power Plugs Are Also Highly Durable Against Electrical And Chemical Wear, Making Them Long-Life Replacement Plugs. Because Of The V-Groove, The Spark Occurs At The Edge Of The Center Electrode-So Heat Is Not Absorbed By The Electrode Itself. This Allows The Flame Kernel To Expand Quickly And Efficiently For A Complete Burn And Great Performance. Shorty Spark Plug: No. Resistor: Yes. Manufacturer Heat Range: 5. Electrode Tip Material: Nickel Alloy. Electrode Core Material: Copper. Insulator Type: Projected. Spark Plug Thread Size: 18Mm. Spark Plug Reach: 0.460 In. Spark Plug Seat Style: Tapered. Wrench Diameter: 13/16 In. Ground Strap Quantity: One.